Be cautious, but not too cautious; do not be too much afraid of making a mistake; a man who never makes a mistake will make nothing.

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.

In this world we do not see things as they are. We see them as we are, because what we see depends mainly on what we are looking for.

We must be careful what we read, and not, like the sailors of Ulysses, take bags of wind for sacks of treasure.

Earth and Sky, Woods and Fields, Lakes and Rivers, the Mountain and the Sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.

A man who is not a good friend to himself cannot be so to any one else.

There can be no merit in believing something which you can neither explain nor understand.