Though it is a great mistake to make friends of the wicked and foolish, it is unwise to make enemies of them, for they are very numerous.
We profit little by books we do not enjoy.
The idle man does not know what it is to enjoy rest, for he has not earned it.
We may sit in our library and yet be in all quarters of the earth.
Do not lay things too much to heart. No one is ever really beaten unless he is discouraged.
Exercise of the muscles keeps the body in health, and exercise of the brain brings peace of mind.