Civilizations can only be understood by those who are civilized.

Art attracts us only by what it reveals of our most secret self.

No one who achieves success does so without acknowledging the help of others. The wise and confident acknowledge this help with gratitude.

I have suffered a great deal from writers who have quoted this or that sentence of mine either out of its context or in juxtaposition to some incongruous matter which quite distorted my meaning, or destroyed it altogether.

In formal logic, a contradiction is the signal of defeat, but in the evolution of real knowledge it marks the first step in progress toward a victory

If a dog jumps into your lap, it is because he is fond of you; but if a cat does the same thing, it is because your lap is warmer.