Leaves of Grass is a poetry collection by American poet Walt Whitman. Though it was first published in 1855, Whitman spent most of his professional life writing and rewriting Leaves of Grass, revising it multiple times until his death.The collection of loosely connected poems represents the celebration of his philosophy of life and humanity and praises nature and the individual human’s role in it. “I myself but write one or two indicative words for the future,I but advance a moment only to wheel and hurry back in the darkness.”