Poetry demands a man with a special gift for it, or else one with a touch of madness in him.

The wise man knows of all things, as far as possible, although he has no knowledge of each of them in detail

There is nothing unequal as the equal treatment of unequals.

Philosophy can make people sick.

Nature makes nothing incomplete, and nothing in vain.

We praise a man who feels angry on the right grounds and against the right persons and also in the right manner at the right moment and for the right length of time.

There is more evidence to prove that saltness [of the sea] is due to the admixture of some substance, besides that which we have adduced. Make a vessel of wax and put it in the sea, fastening its mouth in such a way as to prevent any water getting in. Then the water that percolates through the wax sides of the vessel is sweet, the earthy stuff, the admixture of which makes the water salt, being separated off as it were by a filter.