Any man may easily do harm, but not every man can do good to another.

This world is indeed a living being endowed with a soul and intelligence ... a single visible living entity containing all other living entities, which by their nature are all related.

For this feeling of wonder shows that you are a philosopher, since wonder is the only beginning of philosophy.

The elements of instruction should be presented to the mind in childhood, but not with any compulsion.

All soul is immortal. For that which is always in movement is immortal; that which moves something else, and is moved by something else, in ceasing from movement ceases from living. So only that which moves itself, because it does not abandon itself, never stops moving. But it is also source and first principle of movement for the other things which move.

Excess of liberty, whether it lies in state or individuals, seems only to pass into excess of slavery.

Arithmetic is a kind of knowledge in which the best natures should be trained, and which must not be given up.