By far the best proof is experience.

A prudent question is one-half of wisdom.

We see then how far the monuments of wit and learning are more durable than the monuments of power, or of the hands. For have not the verses of Homer continued twenty-five hundred years or more, without the loss of a syllable or letter; during which time infinite palaces, temples, castles, cities have been decayed and demolished?

If I might control the literature of the household, I would guarantee the well-being of Church and State.

An illustrational form tells you through the intelligence immediately what the form is about, whereas a non-illustrational form works first upon sensation and then slowly leaks back into the fact.

Some men covet knowledge out of a natural curiosity and inquisitive temper; some to entertain the mind with variety and delight; some for ornament and reputation; some for victory and contention; many for lucre and a livelihood; and but few for employing the Divine gift of reason to the use and benefit of mankind.

I think that one of the things is that, if you are going to decide to be a painter, you have got to decide that you are not going to be afraid of making a fool of yourself. I think another thing is to be able to find subjects which really absorb you to try and do. I feel that without a subject you automatically go back into decoration because you haven't got the subject which is always eating into you to bring it back - and the greatest art always returns you to the vulnerability of the human situation.