With God thoughts are colors, with us they are pigments-even the most abstract one may be accompanied by physical pain.

Why does a suppurating lung give so little warning and a sore on the finger so much?

One must judge men not by their opinions, but by what their opinions have made of them.

An hour-glass is a reminder not only of time's quick flight, but also of the dust to which we must at last return

The greater part of human misery is caused by indolence.

We can see nothing whatever of the soul unless it is visible in the expression of the countenance; one might call the faces at a large assembly of people a history of the human soul written in a kind of Chinese ideograms.

Be attentive, feel nothing in vain, measure and compare: this is the whole law of philosophy.