The mind of a bigot to the pupil of the eye; the more light you pour on it, the more it contracts.

A man's mind is stretched by a new idea or sensation, and never shrinks back to its former dimensions.

Insanity is often the logic of an accurate mind overtasked

Many ideas grow better when transplanted into another mind than in the one where they sprang up.

Don't flatter yourselves that friendship authorizes you to say disagreeable things to your intimates. On the contrary, the nearer you come into relation with a person, the more necessary do tact and courtesy become.

A mind that is stretched by a new experience can never go back to its old dimensions.