“Logic is a feeble reed, friend. "Logic" proved that airplanes can't fly and that H-bombs won't work and that stones don't fall out of the sky. Logic is a way of saying that anything which didn't happen yesterday won't happen tomorrow.”

“His was not a small mind bothered by logic and consistency.”

“The drive for power is even less logical than the sex urge . . . and stronger.”

“You can sway a thousand men by appealing to their prejudices quicker than you can convince one man by logic.”

“The Universe was a silly place at best...but the least likely explanation for it was the no-explanation of random chance, the conceit that abstract somethings 'just happened' to be atoms that 'just happened' to get together in ways which 'just happened' to look like consistent laws and some configurations 'just happened' to possess self-awareness and that two 'just happened' to be the Man from Mars and a bald-headed old coot with Jubal inside.”

“Some logics get nervous breakdowns. Overloaded phone system behaves like frightened child. Mike did not have upsets, acquired sense of humor instead. Low one. If he were a man, you wouldn't dare stoop over. His idea of thigh-slapper would be to dump you out of bed — or put itch powder in pressure suit.”

“Do not confuse "duty" with what other people expect of you; they are utterly different. Duty is a debt you owe to yourself to fulfill obligations you have assumed voluntarily. Paying that debt can entail anything from years of patient work to instant willingness to die. Difficult it may be, but the reward is self-respect. But there is no reward at all for doing what other people expect of you, and to do so is not merely difficult, but impossible. It is easier to deal with a footpad than it is with the leech who wants "just a few minutes of your time, please—this won't take long." Time is your total capital, and the minutes of your life are painfully few. If you allow yourself to fall into the vice of agreeing to such requests, they quickly snowball to the point where these parasites will use up 100 percent of your time—and squawk for more! So learn to say No—and to be rude about it when necessary. Otherwise you will not have time to carry out your duty, or to do your own work, and certainly no time for love and happiness. The termites will nibble away your life and leave none of it for you. (This rule does not mean that you must not do a favor for a friend, or even a stranger. But let the choice be yours. Don't do it because it is "expected" of you.)”