Theories of love are found in the works of scientists, philosophers, and theologians.

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

Aristotle uses a mother's love for her child as the prime example of love or friendship.

Ask others about themselves, at the same time, be on guard not to talk too much about yourself.

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.

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

All genuine learning is active, not passive. It involves the use of the mind, not just the memory. It is a process of discovery, in which the student is the main agent, not the teacher.