Why do we need to provide the context in MaterialPageRoute when the build method of the widget is also taking the context?

Question

Why do we need to provide the context in MaterialPageRoute when the build method of the widget is also taking the context?

onPressed: () {
              Navigator.of(context).push(
                MaterialPageRoute(builder: (context) {
                  return Scaffold(
                    appBar: AppBar(
                      title: Text("Second Route"),
                    ),
                    body: Center(
                      child: RaisedButton(
                        onPressed: () {
                          Navigator.pop(context);
                        },
                        child: Text('Go back!'),
                      ),
                    ),
                  );
                }),
              );
            },