"I sing the body electric"

There is that in me - I do not know what it is - but I know it is
   in me.

Wrench'd and sweaty - calm and cool then my body becomes,
I sleep - I sleep long.

I do not know it - it is without name - it is a word unsaid,
It is not in any dictionary, utterance, symbol.

Something it swings on more than the earth I swing on,
To it the creation is the friend whose embracing awakes me.

Perhaps I might tell more. Outlines! I plead for my brothers
   and sisters.

Do you see O my brothers and sisters?
It is not chaos or death - it is form, union, plan - it is eternal
   life - it is Happiness.

(Walt Whitman, Leaves of Grass, section 50 - "Song of Myself")