The wheel of fortune turns round incessantly, and who can say to himself, I shall today be uppermost.

To know your faults and be able to change is the greatest virtue.

Let every man consider virtue as what devolves on himself. He may not yield the performance of it even to his teacher.

When we see persons of worth, we should think of equaling them; when we see persons of a contrary character, we should turn inwards and examine ourselves.

If I hold up one corner of a square and the student cannot workout the other three for himself, I won't go any further.

The failure to cultivate virtue, the failure to examine and analyze what I have learned, the inability to move toward righteousness after being shown the way, the inability to correct my faults-these are the causes of my grief.

Don't use cannon to kill musquito.