Urge and urge and urge,
Always the procreant urge of the world.
Out of the dimness opposite equals advance, always substance and increase, always sex,
Always a knit of identity, always distinction, always a breed of life.
To elaborate is no avail, learn'd and unlearn'd feel that it is so.
Sure as the most certain sure, plumb in the uprights, well entretied, braced in the beams,
Stout as a horse, affectionate, haughty, electrical,
I and this mystery here we stand.
Walt Whitman, Songs of Myself, III