Quintilian

Men, even when alone, lighten their labors by song, however rude it may be.

When defeat is inevitable, it is wisest to yield.

Nothing is more dangerous to men than a sudden change of fortune.

The perfection of art is to conceal art.

To my mind the boy who gives least promise is one in whom the critical faculty develops in advance of the imagination.

While we are examining into everything we sometimes find truth where we least expected it.

In almost everything, experience is more valuable than precept.

Our minds are like our stomaches; they are whetted by the change of their food, and variety supplies both with fresh appetite.

It is worth while too to warn the teacher that undue severity in correcting faults is liable at times to discourage a boy's mind from effort.

The obscurity of a writer is generally in proportion to his incapacity.

A liar should have a good memory.

If you direct your whole thought to work itself none of the things which invade eyes or ears will reach the mind.