The mind never need stop growing. Indeed, one of the few experiences which never pall is the experience of watching one's own mind and how it produces new interests, responds to new stimuli, and develops new thoughts, apparently without effort and almost independently of one's own conscious control.

The teacher's chief difficulty is poverty. He (or she) belongs to a badly paid profession. He cannot dress and live like a workman, but he is sometimes paid as little as an unskilled laborer.

You [the teacher] do not merely insert a lot of facts, if you teach them [the students] properly. It is not like injecting 500 cc. of serum, or administering a year's dose of vitamins.

A teacher must believe in the value and interest of his subject as a doctor believes in health.

Many of the snarly bad-tempered teachers whom we remember with hatred were really nice people soured by years of anxiety and penny-pinching.

Language is a living thing. We can feel it changing. Parts of it become old: they drop off and are forgotten. New pieces bud out, spread into leaves, and become big branches, proliferating.

Like all great teachers he knew that a picture is worth a thousand words and that people learn most quickly by doing something or seeing something done.