Though ambition may be a fault in itself, it is often the mother of virtues.

One thing, however, I must premise, that without the assistance of natural capacity, rules and precepts are of no efficacy.

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

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

Medicine for the dead is too late

It is easier to do many things than to do one thing continuously for a long time.

The prosperous can not easily form a right idea of misery.