Falsehood is easy, truth so difficult.

Of what use, however, is a general certainty that an insect will not walk with his head hindmost, when what you need to know is the play of inward stimulus that sends him hither and thither in a network of possible paths?

Life is measured by the rapidity of change, the succession of influences that modify the being.

Genius is the capacity for receiving and improving by discipline.

In every parting there is an image of death.

The dull mind, once arriving at an inference that flatters the desire, is rarely able to retain the impression that the notion from which the inference started was purely problematic.

There is nothing that will kill a man so soon as having nobody to find fault with but himself.