To be an abstraction does not mean that an entity is nothing. It merely means that its existence is only a factor of a more concrete element of nature.

Thus the negative perception is the triumph of consciousness.

That knowledge which adds greatness to character is knowledge so handled as to transform every phase of immediate experience.

The study of mathematics is apt to commence in disappointment.

Civilizations can only be understood by those who are civilized.

Common sense is genius in homespun.

After you understand about the sun and the stars and the rotation of the earth, you may still miss the radiance of the sunset.