diff --git a/CHANGELOG.md b/CHANGELOG.md
index d760253d..5dc0ae5f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Support for calling constructors functions with NewInstance on Function
 - Build v8 with i18n support
 
+### Changed
+- Removed error return value from Context.Isolate() which never fails
+- Removed error return value from NewObjectTemplate and NewFunctionTemplate. Panic if given a nil argument.
+
 ## [v0.6.0] - 2021-05-11
 
 ### Added
diff --git a/README.md b/README.md
index 60379e58..766a7e7c 100644
--- a/README.md
+++ b/README.md
@@ -45,11 +45,11 @@ if _, err := ctx2.RunScript("multiply(3, 4)", "main.js"); err != nil {
 ```go
 iso, _ := v8go.NewIsolate() // create a new VM
 // a template that represents a JS function
-printfn, _ := v8go.NewFunctionTemplate(iso, func(info *v8go.FunctionCallbackInfo) *v8go.Value {
+printfn := v8go.NewFunctionTemplate(iso, func(info *v8go.FunctionCallbackInfo) *v8go.Value {
     fmt.Printf("%v", info.Args()) // when the JS function is called this Go callback will execute
     return nil // you can return a value back to the JS caller if required
 })
-global, _ := v8go.NewObjectTemplate(iso) // a template that represents a JS Object
+global := v8go.NewObjectTemplate(iso) // a template that represents a JS Object
 global.Set("print", printfn) // sets the "print" property of the Object to our function
 ctx, _ := v8go.NewContext(iso, global) // new Context with the global Object set to our object template
 ctx.RunScript("print('foo')", "print.js") // will execute the Go callback with a single argunent 'foo'
@@ -105,7 +105,7 @@ case val := <- vals:
 case err := <- errs:
     // javascript error
 case <- time.After(200 * time.Milliseconds):
-    vm, _ := ctx.Isolate() // get the Isolate from the context
+    vm := ctx.Isolate() // get the Isolate from the context
     vm.TerminateExecution() // terminate the execution 
     err := <- errs // will get a termination error back from the running script
 }
diff --git a/context.go b/context.go
index 4c72d977..d2563c8a 100644
--- a/context.go
+++ b/context.go
@@ -83,9 +83,8 @@ func NewContext(opt ...ContextOption) (*Context, error) {
 
 // Isolate gets the current context's parent isolate.An  error is returned
 // if the isolate has been terninated.
-func (c *Context) Isolate() (*Isolate, error) {
-	// TODO: [RC] check to see if the isolate has not been terninated
-	return c.iso, nil
+func (c *Context) Isolate() *Isolate {
+	return c.iso
 }
 
 // RunScript executes the source JavaScript; origin or filename provides a
diff --git a/context_test.go b/context_test.go
index 307f4d13..c4dcf6c4 100644
--- a/context_test.go
+++ b/context_test.go
@@ -27,7 +27,7 @@ func TestContextExec(t *testing.T) {
 		t.Errorf("error not expected: %v", err)
 	}
 
-	iso, _ := ctx.Isolate()
+	iso := ctx.Isolate()
 	ctx2, _ := v8go.NewContext(iso)
 	_, err = ctx2.RunScript(`add`, "ctx2.js")
 	if err == nil {
@@ -150,7 +150,7 @@ func ExampleContext_isolate() {
 
 func ExampleContext_globalTemplate() {
 	iso, _ := v8go.NewIsolate()
-	obj, _ := v8go.NewObjectTemplate(iso)
+	obj := v8go.NewObjectTemplate(iso)
 	obj.Set("version", "v1.0.0")
 	ctx, _ := v8go.NewContext(iso, obj)
 	val, _ := ctx.RunScript("version", "main.js")
diff --git a/function_template.go b/function_template.go
index dd3485d3..7416d649 100644
--- a/function_template.go
+++ b/function_template.go
@@ -8,7 +8,6 @@ package v8go
 // #include "v8go.h"
 import "C"
 import (
-	"errors"
 	"runtime"
 	"unsafe"
 )
@@ -40,12 +39,12 @@ type FunctionTemplate struct {
 }
 
 // NewFunctionTemplate creates a FunctionTemplate for a given callback.
-func NewFunctionTemplate(iso *Isolate, callback FunctionCallback) (*FunctionTemplate, error) {
+func NewFunctionTemplate(iso *Isolate, callback FunctionCallback) *FunctionTemplate {
 	if iso == nil {
-		return nil, errors.New("v8go: failed to create new FunctionTemplate: Isolate cannot be <nil>")
+		panic("nil Isolate argument not supported")
 	}
 	if callback == nil {
-		return nil, errors.New("v8go: failed to create new FunctionTemplate: FunctionCallback cannot be <nil>")
+		panic("nil FunctionCallback argument not supported")
 	}
 
 	cbref := iso.registerCallback(callback)
@@ -55,11 +54,12 @@ func NewFunctionTemplate(iso *Isolate, callback FunctionCallback) (*FunctionTemp
 		iso: iso,
 	}
 	runtime.SetFinalizer(tmpl, (*template).finalizer)
-	return &FunctionTemplate{tmpl}, nil
+	return &FunctionTemplate{tmpl}
 }
 
 // GetFunction returns an instance of this function template bound to the given context.
 func (tmpl *FunctionTemplate) GetFunction(ctx *Context) *Function {
+	// TODO: Consider propagating the v8::FunctionTemplate::GetFunction error
 	val_ptr := C.FunctionTemplateGetFunction(tmpl.ptr, ctx.ptr)
 	return &Function{&Value{val_ptr, ctx}}
 }
diff --git a/function_template_test.go b/function_template_test.go
index 2598ddfe..2ae58651 100644
--- a/function_template_test.go
+++ b/function_template_test.go
@@ -17,24 +17,39 @@ import (
 func TestFunctionTemplate(t *testing.T) {
 	t.Parallel()
 
-	if _, err := v8go.NewFunctionTemplate(nil, func(*v8go.FunctionCallbackInfo) *v8go.Value { return nil }); err == nil {
-		t.Error("expected error but got <nil>")
-	}
-
 	iso, _ := v8go.NewIsolate()
-	if _, err := v8go.NewFunctionTemplate(iso, nil); err == nil {
-		t.Error("expected error but got <nil>")
-	}
-
-	fn, err := v8go.NewFunctionTemplate(iso, func(*v8go.FunctionCallbackInfo) *v8go.Value { return nil })
-	if err != nil {
-		t.Errorf("unexpected error: %v", err)
-	}
+	fn := v8go.NewFunctionTemplate(iso, func(*v8go.FunctionCallbackInfo) *v8go.Value { return nil })
 	if fn == nil {
 		t.Error("expected FunctionTemplate, but got <nil>")
 	}
 }
 
+func TestFunctionTemplate_panic_on_nil_isolate(t *testing.T) {
+	t.Parallel()
+
+	defer func() {
+		if err := recover(); err == nil {
+			t.Error("expected panic")
+		}
+	}()
+	v8go.NewFunctionTemplate(nil, func(*v8go.FunctionCallbackInfo) *v8go.Value {
+		t.Error("unexpected call")
+		return nil
+	})
+}
+
+func TestFunctionTemplate_panic_on_nil_callback(t *testing.T) {
+	t.Parallel()
+
+	defer func() {
+		if err := recover(); err == nil {
+			t.Error("expected panic")
+		}
+	}()
+	iso, _ := v8go.NewIsolate()
+	v8go.NewFunctionTemplate(iso, nil)
+}
+
 func TestFunctionTemplateGetFunction(t *testing.T) {
 	t.Parallel()
 
@@ -42,7 +57,7 @@ func TestFunctionTemplateGetFunction(t *testing.T) {
 	ctx, _ := v8go.NewContext(iso)
 
 	var args *v8go.FunctionCallbackInfo
-	tmpl, _ := v8go.NewFunctionTemplate(iso, func(info *v8go.FunctionCallbackInfo) *v8go.Value {
+	tmpl := v8go.NewFunctionTemplate(iso, func(info *v8go.FunctionCallbackInfo) *v8go.Value {
 		args = info
 		reply, _ := v8go.NewValue(iso, "hello")
 		return reply
@@ -66,8 +81,8 @@ func TestFunctionTemplateGetFunction(t *testing.T) {
 
 func ExampleFunctionTemplate() {
 	iso, _ := v8go.NewIsolate()
-	global, _ := v8go.NewObjectTemplate(iso)
-	printfn, _ := v8go.NewFunctionTemplate(iso, func(info *v8go.FunctionCallbackInfo) *v8go.Value {
+	global := v8go.NewObjectTemplate(iso)
+	printfn := v8go.NewFunctionTemplate(iso, func(info *v8go.FunctionCallbackInfo) *v8go.Value {
 		fmt.Printf("%+v\n", info.Args())
 		return nil
 	})
@@ -80,9 +95,9 @@ func ExampleFunctionTemplate() {
 
 func ExampleFunctionTemplate_fetch() {
 	iso, _ := v8go.NewIsolate()
-	global, _ := v8go.NewObjectTemplate(iso)
+	global := v8go.NewObjectTemplate(iso)
 
-	fetchfn, _ := v8go.NewFunctionTemplate(iso, func(info *v8go.FunctionCallbackInfo) *v8go.Value {
+	fetchfn := v8go.NewFunctionTemplate(iso, func(info *v8go.FunctionCallbackInfo) *v8go.Value {
 		args := info.Args()
 		url := args[0].String()
 
diff --git a/function_test.go b/function_test.go
index 196bcb15..4ef22af0 100644
--- a/function_test.go
+++ b/function_test.go
@@ -19,7 +19,7 @@ func TestFunctionCall(t *testing.T) {
 	failIf(t, err)
 	addValue, err := ctx.Global().Get("add")
 	failIf(t, err)
-	iso, _ := ctx.Isolate()
+	iso := ctx.Isolate()
 
 	arg1, err := v8go.NewValue(iso, int32(1))
 	failIf(t, err)
@@ -66,10 +66,10 @@ func TestFunctionCallToGoFunc(t *testing.T) {
 	t.Parallel()
 
 	iso, _ := v8go.NewIsolate()
-	global, _ := v8go.NewObjectTemplate(iso)
+	global := v8go.NewObjectTemplate(iso)
 
 	called := false
-	printfn, _ := v8go.NewFunctionTemplate(iso, func(info *v8go.FunctionCallbackInfo) *v8go.Value {
+	printfn := v8go.NewFunctionTemplate(iso, func(info *v8go.FunctionCallbackInfo) *v8go.Value {
 		called = true
 		return nil
 	})
@@ -120,8 +120,7 @@ func TestFunctionNewInstance(t *testing.T) {
 
 	ctx, err := v8go.NewContext()
 	failIf(t, err)
-	iso, err := ctx.Isolate()
-	failIf(t, err)
+	iso := ctx.Isolate()
 
 	value, err := ctx.Global().Get("Error")
 	failIf(t, err)
diff --git a/isolate_test.go b/isolate_test.go
index c10e8cf7..922fbb99 100644
--- a/isolate_test.go
+++ b/isolate_test.go
@@ -103,7 +103,7 @@ func TestIsolateGarbageCollection(t *testing.T) {
 	val, _ := v8go.NewValue(iso, "some string")
 	fmt.Println(val.String())
 
-	tmpl, _ := v8go.NewObjectTemplate(iso)
+	tmpl := v8go.NewObjectTemplate(iso)
 	tmpl.Set("foo", "bar")
 	v8go.NewContext(iso, tmpl)
 
diff --git a/object_template.go b/object_template.go
index a55ed7ac..2447f6f7 100644
--- a/object_template.go
+++ b/object_template.go
@@ -36,9 +36,9 @@ type ObjectTemplate struct {
 
 // NewObjectTemplate creates a new ObjectTemplate.
 // The *ObjectTemplate can be used as a v8go.ContextOption to create a global object in a Context.
-func NewObjectTemplate(iso *Isolate) (*ObjectTemplate, error) {
+func NewObjectTemplate(iso *Isolate) *ObjectTemplate {
 	if iso == nil {
-		return nil, errors.New("v8go: failed to create new ObjectTemplate: Isolate cannot be <nil>")
+		panic("nil Isolate argument not supported")
 	}
 
 	tmpl := &template{
@@ -46,7 +46,7 @@ func NewObjectTemplate(iso *Isolate) (*ObjectTemplate, error) {
 		iso: iso,
 	}
 	runtime.SetFinalizer(tmpl, (*template).finalizer)
-	return &ObjectTemplate{tmpl}, nil
+	return &ObjectTemplate{tmpl}
 }
 
 // NewInstance creates a new Object based on the template.
@@ -55,6 +55,7 @@ func (o *ObjectTemplate) NewInstance(ctx *Context) (*Object, error) {
 		return nil, errors.New("v8go: Context cannot be <nil>")
 	}
 
+	// TODO: propagate v8 error
 	valPtr := C.ObjectTemplateNewInstance(o.ptr, ctx.ptr)
 	return &Object{&Value{valPtr, ctx}}, nil
 }
diff --git a/object_template_test.go b/object_template_test.go
index a34299bb..3e747edd 100644
--- a/object_template_test.go
+++ b/object_template_test.go
@@ -13,15 +13,8 @@ import (
 
 func TestObjectTemplate(t *testing.T) {
 	t.Parallel()
-	_, err := v8go.NewObjectTemplate(nil)
-	if err == nil {
-		t.Fatal("expected error but got <nil>")
-	}
 	iso, _ := v8go.NewIsolate()
-	obj, err := v8go.NewObjectTemplate(iso)
-	if err != nil {
-		t.Fatalf("unexpected error: %v", err)
-	}
+	obj := v8go.NewObjectTemplate(iso)
 
 	setError := func(t *testing.T, err error) {
 		if err != nil {
@@ -30,7 +23,7 @@ func TestObjectTemplate(t *testing.T) {
 	}
 
 	val, _ := v8go.NewValue(iso, "bar")
-	objVal, _ := v8go.NewObjectTemplate(iso)
+	objVal := v8go.NewObjectTemplate(iso)
 	bigbigint, _ := new(big.Int).SetString("36893488147419099136", 10) // larger than a single word size (64bit)
 	bigbignegint, _ := new(big.Int).SetString("-36893488147419099136", 10)
 
@@ -62,6 +55,17 @@ func TestObjectTemplate(t *testing.T) {
 	}
 }
 
+func TestObjectTemplate_panic_on_nil_isolate(t *testing.T) {
+	t.Parallel()
+
+	defer func() {
+		if err := recover(); err == nil {
+			t.Error("expected panic")
+		}
+	}()
+	v8go.NewObjectTemplate(nil)
+}
+
 func TestGlobalObjectTemplate(t *testing.T) {
 	t.Parallel()
 	iso, _ := v8go.NewIsolate()
@@ -72,7 +76,7 @@ func TestGlobalObjectTemplate(t *testing.T) {
 	}{
 		{
 			func() *v8go.ObjectTemplate {
-				gbl, _ := v8go.NewObjectTemplate(iso)
+				gbl := v8go.NewObjectTemplate(iso)
 				gbl.Set("foo", "bar")
 				return gbl
 			},
@@ -89,9 +93,9 @@ func TestGlobalObjectTemplate(t *testing.T) {
 		},
 		{
 			func() *v8go.ObjectTemplate {
-				foo, _ := v8go.NewObjectTemplate(iso)
+				foo := v8go.NewObjectTemplate(iso)
 				foo.Set("bar", "baz")
-				gbl, _ := v8go.NewObjectTemplate(iso)
+				gbl := v8go.NewObjectTemplate(iso)
 				gbl.Set("foo", foo)
 				return gbl
 			},
@@ -121,7 +125,7 @@ func TestGlobalObjectTemplate(t *testing.T) {
 func TestObjectTemplateNewInstance(t *testing.T) {
 	t.Parallel()
 	iso, _ := v8go.NewIsolate()
-	tmpl, _ := v8go.NewObjectTemplate(iso)
+	tmpl := v8go.NewObjectTemplate(iso)
 	if _, err := tmpl.NewInstance(nil); err == nil {
 		t.Error("expected error but got <nil>")
 	}
diff --git a/object_test.go b/object_test.go
index 041d6fca..21dd8bd3 100644
--- a/object_test.go
+++ b/object_test.go
@@ -15,7 +15,6 @@ func TestObjectMethodCall(t *testing.T) {
 	t.Parallel()
 
 	ctx, _ := v8go.NewContext()
-	iso, _ := ctx.Isolate()
 	val, _ := ctx.RunScript(`class Obj { constructor(input) { this.input = input, this.prop = "" } print() { return this.input.toString() } }; new Obj("some val")`, "")
 	obj, _ := val.AsObject()
 	val, err := obj.MethodCall("print")
@@ -27,7 +26,7 @@ func TestObjectMethodCall(t *testing.T) {
 	val, err = ctx.RunScript(`class Obj2 { print(str) { return str.toString() } }; new Obj2()`, "")
 	failIf(t, err)
 	obj, _ = val.AsObject()
-	arg, _ := v8go.NewValue(iso, "arg")
+	arg, _ := v8go.NewValue(ctx.Isolate(), "arg")
 	_, err = obj.MethodCall("print", arg)
 	failIf(t, err)
 	_, err = obj.MethodCall("notamethod")
@@ -126,8 +125,8 @@ func ExampleObject_global() {
 	ctx, _ := v8go.NewContext(iso)
 	global := ctx.Global()
 
-	console, _ := v8go.NewObjectTemplate(iso)
-	logfn, _ := v8go.NewFunctionTemplate(iso, func(info *v8go.FunctionCallbackInfo) *v8go.Value {
+	console := v8go.NewObjectTemplate(iso)
+	logfn := v8go.NewFunctionTemplate(iso, func(info *v8go.FunctionCallbackInfo) *v8go.Value {
 		fmt.Println(info.Args()[0])
 		return nil
 	})
diff --git a/promise.go b/promise.go
index 7ab63dd3..5db55e04 100644
--- a/promise.go
+++ b/promise.go
@@ -41,6 +41,7 @@ func NewPromiseResolver(ctx *Context) (*PromiseResolver, error) {
 	}
 	ptr := C.NewPromiseResolver(ctx.ptr)
 	val := &Value{ptr, ctx}
+	// TODO: Propagate Promise::Resolver::New error
 	return &PromiseResolver{&Object{val}, nil}, nil
 }