Conclusions from observations are unreliable, only the mind can come nearer to to the truth. Thus, in some ways, philosophy is more important than science.

Appearances are but a glimpse of what is hidden.

The descent into Hades is much the same from whatever place we start.

Appearances are a glimpse of the unseen.

It is not I who have lost the Athenians, but the Athenians who have lost me.

All other things have a portion of everything, but Mind is infinite and self-ruled, and is mixed with nothing but is all alone by itself.

The purpose of life is the investigation of the Sun, the Moon, and the heavens.