Walt Whitman said this quote

I like the scientific spirit—the holding off, the being sure but not too sure, the willingness to surrender ideas when the evidence is against them: this is ultimately fine—it always keeps the way beyond open—always gives life, thought, affection, the whole man, a chance to try over again after a mistake—after a wrong guess.

~ Walt Whitman

O Me! O life!... of the questions of these recurring; Of the endless trains of the faithless—of cities fill’d with the foolish; Of myself forever reproaching myself, (for who more foolish than I, and who more faithless?) Of eyes that vainly crave the light—of the objects mean—of the struggle ever renew’d; Of the poor results of all—of the plodding and sordid crowds I see around me; Of the empty and useless years of the rest—with the rest me intertwined; The question, O me! so sad, recurring—What good amid these, O me, O life? Answer.That you are here—that life exists, and identity; That the powerful play goes on, and you will contribute a verse.

~ Walt Whitman

WE two boys together clinging,One the other never leaving,Up and down the roads going, North and South excursions making,Power enjoying, elbows stretching, fingers clutching,Arm'd and fearless, eating, drinking, sleeping, loving.No law less than ourselves owning, sailing, soldiering, thieving,threatening,Misers, menials, priests alarming, air breathing, water drinking, onthe turf or the sea-beach dancing,Cities wrenching, ease scorning, statutes mocking, feeblenesschasing,Fulfilling our foray.

~ Walt Whitman

The untold want, by life and land ne'er granted,Now, Voyager, sail thou forth, to seek and find.

~ Walt Whitman