Question

I know I have the best of time and space, and was never measured and never will be measured. How does this line support the theme of the poem?

Answer 1

here's the answer : It reflects Whitman’s ideas about the capacity of the human spirit.

Answer 2

The main theme is the presence of a very powerful individualistic persona that is the narrator. It is supported by those lines because of the astounding individuality and solipsism seen where the person claims that he knows the best of time and space and was never measured and will never be measured. It is a celebration of individualism and the self.