Having a body is in itself the greatest threat to the mind... The body encloses the mind in a fortress; before long the mind is besieged on all sides, and in the end the mind has to give itself up.

It is grief that develops the powers of the mind.

There's nothing like desire to prevent the things one says from having any resemblance to the things in one's mind.

We see things but we don't see them, like things that slid through the mind, one flowing into another.