I hear and I forget. I see and I remember. I do and I understand.

You don't really understand something unless you can communicate it in a simple way.

Make everything as simple as possible, but not simpler.

In teaching there are three ever-present factors: first, what the teacher is; secondly, what the teacher says; and thirdly, what the teacher does. The least important of these is what the teacher says; the other two are most vital in child training. It is worse folly for a teacher to attempt to teach something which he himself does not believe. There is a sixth sense in most of us, and particularly in children and youth, which instinctively detects the inconsistency between pretension as expressed in words and reality as it exists in thought and feeling. A dishonest teacher cannot effectively teach honesty, nor an athiest teach belief in God, nor an immoral one teach purity of life. True teaching springs from the heart, not from vocal chords.

It is with words as with sunbeams, the more they are condensed, the deeper they burn.

Everyone hears only what he understands.

Don't teach so that you can be understood. Teach so that you can't be misunderstood.

Teaching should be such that what is offered is perceived as a valuable gift and not as a hard duty.

I never teach my pupils; I only attempt to provide the conditions in which they can learn.

Jesus taught in parables so that those who didn’t understand would not be brought under condemnation. Had he taught using always explicit declaration, many more would be held responsible for that which they knew.