Here is a thing which the more it is needed the more it is rejected: and this is advice, which is unwillingly heeded by those who most need it, that is to say, by the ignorant.

The part always has a tendency to reunite with its whole in order to escape from its imperfection.

Learning is the only thing that never disappoints us.

Nature is full of infinite causes that have never occurred in experience.

Darkness is absence of light. Shadow is diminution of light.

We know more about the movement of celestial bodies than about the soil underfoot.

The supreme misfortune is when theory outstrips performance