1. Few people think more than two or three times a year. I've made an international reputation for myself by thinking once or twice a week. ~George Bernard Shaw
2. He who will not reason is a bigot, he who cannot is a fool; he who dares not is a slave. ~William Drummond
3. It takes a very unusual mind to make an analysis of the obvious. ~Alfred North Whitehead
4. Let us admit the case of the conservative; if we once start thinking, no one can guarantee where we shall come out; except that many ends, objects and institutions are doomed. Every thinker puts some portion of an apparently stable world in peril, and no one can wholly predict what will emerge in its place. ~John Dewey
5. Man's mind, stretched to a new idea, never goes back to its original dimension. ~Oliver Wendell Holmes
6. Mind, n. A mysterious form of matter secreted by the brain. Brain, n. An apparatus with which we think that we think. ~Ambrose Bierce
7. Ours is the age that is proud of machines that think, and suspicious of men who try to. ~H. Mumford Jones
8. The obscure we see eventually. The completely apparent takes longer. ~E. R. Murrow
9. The only reason some people get lost in thought is because it's unfamiliar territory. ~Paul Fix
10. The spirit of the age is filled with disdain for thinking. ~Albert Schweitzer
11. The uncreative mind can spot wrong answers, but it takes a very creative mind to spot wrong questions. ~Antony Jay
12. Vivere est cogitare. ~To think is to live ~Marcus Tullius Cicero
13. When the only tool you have is a hammer, you tend to treat everything as if it were a nail. ~Abraham Maslow