No one would choose a friendless existence on condition of having all the other things in the world.

The character which results from wealth is that of a prosperous fool.

Tools may be animate as well as inanimate; for instance, a ship's captain uses a lifeless rudder, but a living man for watch; for a servant is, from the point of view of his craft, categorized as one of its tools. So any piece of property can be regarded as a tool enabling a man to live, and his property is an assemblage of such tools; a slave is a sort of living piece of property; and like any other servant is a tool in charge of other tools.

The intelligence consists not only in the knowledge but also in the skill to apply the knowledge into practice.

The purpose of art is to represent the meaning of things. This represents the true reality, not external aspects.

Quite often good things have hurtful consequences. There are instances of men who have been ruined by their money or killed by their courage.

For any two portions of fire, small or great, will exhibit the same ratio of solid to void; but the upward movement of the greater is quicker than that of the less, just as the downward movement of a mass of gold or lead, or of any other body endowed with weight, is quicker in proportion to its size.