Painting is poetry that is seen rather than felt, and poetry is painting that is felt rather than seen.

Just as iron rusts from disuse, and stagnant water putrefies, or when cold turns to ice, so our intellect wastes unless it is kept in use.

If you are on the side whence the wind is blowing you will see the trees looking much lighter than you would see them on the other sides; and this is due to the fact that the wind turns up the reverse side of the leaves which in all trees is much whiter than the upper side.

Poor is the pupil who does not surpass his master.

Of several bodies, all equally large and equally distant, that which is most brightly illuminated will appear to the eye nearest and largest.

Life, when is spent well, is long.

Every action done by nature is done in the shortest way.