Hippodamus, son of Euryphon, a native of Miletus, invented the art of planning and laid out the street plan of Piraeus.

The mathematical sciences particularly exhibit order symmetry and limitations; and these are the greatest forms of the beautiful.

The least initial deviation from the truth is multiplied later a thousandfold.

A man becomes a friend whenever being loved he loves in return.

For contemplation is both the highest form of activity (since the intellect is the highest thing in us, and the objects that it apprehends are the highest things that can be known), and also it is the most continuous, because we are more capable of continuous contemplation than we are of any practical activity.

The ultimate end...is not knowledge, but action. To be half right on time may be more important than to obtain the whole truth too late.

The specific excellence of verbal expression in poetry is to be clear without being low.