The art of being wise is the art of knowing what to overlook.

The first lecture in psychology that I ever heard was the first I ever gave.

The great use of life is to spend it for something that will outlast it.

If you give appreciation to people, you win their goodwill.

To be fertile in hypotheses is the first perquisite of creativity and to be willing to throw them away the moment experience contradicts them is the next.

To kill time is not murder, it's suicide.

Many persons nowadays seem to think that any conclusion must be very scientific if the arguments in favor of it are derived from twitching of frogs' legs (especially if the frogs are decapitated) and that, on the other hand, any doctrine chiefly vouched for by the feelings of human beings (with heads on their shoulders) must be benighted and superstitious.