To conquer oneself is the best and noblest victory; to be vanquished by one's own nature is the worst and most ignoble defeat.

The cure of the part should not be attempted without the cure of the whole.

Music gives wings to the mind and flight to the imagination.

No man should bring children into the world who is unwilling to persevere to the end in their nature and education.

Seven years of silent inquiry are needful for a man to learn the truth, but fourteen in order to learn how to make it known to his fellow-men.

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.

To the rulers of the state then, if to any, it belongs of right to use falsehood, to deceive either enemies or their own citizens, for the good of the state: and no one else may meddle with this privilege.