In the Book of Poetry there are three hundred poems, but the meaning of all of them may be put in a single sentence: Have no debasing thoughts.

The gem cannot be polished without friction nor man without trials.

If language is not rectified, words do not correspond to meaning, and if words do not correspond to meaning, our deeds cannot be accomplished.

We should not be too familiar with the lower orders or with women.

Who contains himself goes seldom wrong.

Because the newer methods of treatment are good, it does not follow that the old ones were bad: for if our honorable and worshipful ancestors had not recovered from their ailments, you and I would not be here today.

Fine words and an insinuating appearance are seldom associated with true virtue.