here's a two-fer:
"all knowledge, like all ignorance, deviates from truth in an opportunistic direction" - gunnar myrdal, the challenge of world poverty
this hangs above my dad's desk,
"the two most common elements in the universe are hydrogen and stupidity" -
"My philosophy of life is that the meek shall inherit nothing but debasement, frustration and ignoble deaths; that there is security in personal strength; that you CAN fight City Hall and WIN; that any action is better than no action, even if it's the wrong action; that you never reach glory or self-fulfillment unless you're willing to risk everything, dare anything, put yourself dead on the line every time; and that once one becomes strong or rich or potent or powerful it is the responsibility of the strong to help the weak BECOME strong."
- harlan ellison