The understanding of mathematics is necessary for a sound grasp of ethics.

If we pursue our habit of eating animals, and if our neighbour follows a similar path, will we need to go to war against our neighbour to secure greater pasturage, because ours will not be enough to sustain us, and our neighbour will have a similar need to wage war on us for the same reason.

What a lot of things I don't need.

The soul is pure when it leaves the body and drags nothing bodily with it, by virtue of having no willing association with the body in life but avoiding it.......Practicing philosophy in the right way is a training to die easily.

Every pleasure or pain has a sort of rivet with which it fastens the soul to the body and pins it down and makes it corporeal, accepting as true whatever the body certifies.

Musical training is a more potent instrument than any other, because rhythm and harmony find their way into the inward places of the soul, on which they mightily fasten, imparting grace, and making the soul of him who is rightly educated graceful, or of him who is ill-educated ungraceful.

Nothing is so well learned as that which is discovered.