Moral virtue is a mean . . . between two vices, one of excess and the other of defect; . . . it is such a mean because it aims at hitting the middle point in feelings and in actions. This is why it is a hard task to be good, for it is hard to find the middle point in anything.

And yet the true creator is necessity, which is the mother of invention.

It is the mark of an educated mind to be able to entertain a thought without accepting it.

And so long as they were at war, their power was preserved, but when they had attained empire they fell, for of the arts of peace they knew nothing, and had never engaged in any employment higher than war.

The line has magnitude in one way, the plane in two ways, and the solid in three ways, and beyond these there is no other magnitude because the three are all.

The ultimate value of life depends upon awareness and the power of contemplation rather than upon mere survival.

Either a beast or a god.