There are innumerable worlds of different sizes. In some there is neither sun not moon, in others they are larger than in ours and others have more than one. These worlds are at irregular distances, more in one direction and less in another, and some are flourishing, others declining. Here they come into being, there they die, and they are distroyed by collision with one another. Some of the worlds have no animal or vegetable life nor any water.

Soul and intellect are just the same things.

The pride of youth is in strength and beauty, the pride of old age is in discretion.

The first principles of the universe are atoms and empty space; everything else is merely thought to exist.

By convention sweet is sweet, by convention bitter is bitter, by convention hot is hot, by convention cold is cold, by convention color is color. But in reality there are atoms and the void. That is, the objects of sense are supposed to be real and it is customary to regard them as such, but in truth they are not. Only the atoms and the void are real.

It is greed to do all the talking but not to want to listen at all.

Many much-learned men have no intelligence.