Don't be 'consistent,' but be simply true.

Science is the topography of ignorance.

Science is a first-rate piece of furniture for a man's upper chamber, if he has common sense on the ground-floor. But if a man hasn't got plenty of good common sense, the more science he has, the worse for his patient.

Without wearing any mask we are conscious of, we have a special face for each friend.

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.

Apology is only egotism wrong side out.

It is the province of knowledge to speak, and it is the privilege of wisdom to listen.