When you know a thing, to hold that you know it, and when you do not know a thing, to allow that you do not know it - this is knowledge.

In teaching there should be no distinction of classes.

These are the four abuses: desire to succeed in order to make oneself famous; taking credit for the labors of others; refusal to correct one's errors despite advice; refusal to change one's ideas despite warnings.

When it is obvious that the goals cannot be reached, don't adjust the goals, adjust the action steps.

The wise find pleasure in water; the virtuous find pleasure in hills. The wise are active; the virtuous are tranquil. The wise are joyful; the virtuous are long-lived.

By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest.

He who take cookie to bed have crummy night ahead.