If you only care enough for a result, you will almost certainly attain it. Only you must, then, really wish these things, and wish them exclusively, and not wish at the same time a hundred other incompatible things just as strongly.

Psychology ought certainly to give the teacher radical help.

In all this process of acquiring conceptions, a certain instinctive order is followed. There is a native tendency to assimilate certain kinds of conception at one age, and other kinds of conception at a later age.

Emotional occasions, especially violent ones, are extremely potent in precipitating mental rearrangements. The sudden and explosive ways in which love, jealousy, guilt, fear, remorse, or anger can seize upon one are known to everybody. . . . And emotions that come in this explosive way seldom leave things as they found them.

Let everything you do be done as if it makes a difference.

Whatever universe a professor believes in must at any rate be a universe that lends itself to lengthy discourse. A universe definable in two sentences is something for which the professorial intellect has no use. No faith in anything of that cheap kind!

In order to disprove the assertion that all crows are black, one white crow is sufficient.