Many of the twisted minds and crippled characters in the world were made by careless parents who kept their children away from knives and fires, but put permanent scars on their souls.

The young do not demand omniscience. They know it is unattainable. They do demand sincerity.

Wherever there are beginners and experts, old and young, there is some kind of learning going on, some kind of teaching. We are all pupils and we are all teachers.

The aim of those who try to control thought is always the same. They find one single explanation of the world, one system of thought and action that will (they believe) cover everything; and then they try to impose that on all thinking people.

The relation between parents and children is essentially based on teaching.

A period of high civilization is one in which thoughts fly freely from mind to mind, from one country to another-yes, from the past into the present.

These are not books, lumps of lifeless paper, but minds alive on the shelves.