“Of what significance the things you can forget? A little thought is sexton to all the world.”
Life Without Principle (1863)
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Henry David Thoreau 385
1817-1862 American poet, essayist, naturalist, and abolitio… 1817–1862Related quotes

“Orthodoxy is the diehard of the world of thought. It learns not, neither can it forget.”
No reliable source makes this quote disputed.
Unattributed

Interview on the History Channel documentary Getting High - The History of LSD, 2001; sampled on Drop Out by Infected Mushroom

Grace Slick, and Leary are both quoted in the Infected Mushroom song "Drop out" on the EP Deeply Disturbed (2003), but only the final portion actually quotes Leary.
Misattributed
Source: Your Job-Hunt Ltd – Advice from an Award-Winning Asian Headhunter (2003), p.91

Michael Franti Interview http://www.youtube.com/watch?v=5s75CPceiCw&feature=related