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.

He who is fixed to a star does not change his mind.

Truth is so excellent, that if it praises but small things they become noble.

Learning is the only thing that never disappoints us.

Given the cause nature produces the effect in the briefest manner that it can employ.

The light and heat of the universe comes from the sun, and its cold and darkness from the withdrawal of the sun.

The mind that engages in subjects of too great variety becomes confused and weakened.