The virtuous man is driven by responsibility, the non-virtuous man is driven by profit.

To learn and from time to time to apply what one has learned - isn't that a pleasure?

Man is born for uprightness. If a man lose his uprightness and yet live, his escape from death is mere good fortune.

A reasonable man adjusts himself to the world. An unreasonable man expects the world to adjust itself to him. Therefore all progress is made by unreasonable people.

Hold faithfulness and sincerity as first principles.

If you shoot for the stars and hit the moon, it's OK. But you've got to shoot for something. A lot of people don't even shoot.

What you know, you know, what you don't know, you don't know. This is true wisdom.