Give bread to a stranger, in the name of the universal brotherhood which binds together all men under the common father of nature.

That which offends the ear will not easily gain admission to the mind.

The learned understand the reason of art; the unlearned feel the pleasure.

That which prematurely arrives at perfection soon perishes.

Nature herself has never attempted to effect great changes rapidly.

Consequently the student who is devoid of talent will derive no more profit from this work than barren soil from a treatise on agriculture.

Those who wish to appear wise among fools, among the wise seem foolish.