It is love rather than sexual lust or unbridled sexuality if, in addition to the need or want involved, there is also some impulse to give pleasure to the persons thus loved and not merely to use them for our own selfish pleasure.

Wonder is the beginning of wisdom in learning from books as well as from nature.

If you ask a living teacher a question, he will probably answer you. If you are puzzled by what he says, you can save yourself the trouble of thinking by asking him what he means. If, however, you ask a book a question, you must answer it yourself. In this respect a book is like nature or the world. When you question it, it answers you only to the extent that you do the work of thinking an analysis yourself.

Love consists in giving without getting in return; in giving what is not owed, what is not due the other. That's why true love is never based, as associations for utility or pleasure are, on a fair exchange.

A lecture has been well described as the process whereby the notes of the teacher become the notes of the student without passing through the mind of either.

The purpose of learning is growth, and our minds, unlike our bodies, can continue growing as we continue to live.

The telephone book is full of facts, but it doesn't contain a single idea.