Thales of Miletus

When he was asked why he did not have children, he replied, "because of my love for children." And they say that when his mother tried to compel him to marry he would say, "It is not yet the right time," and then, as she insisted when he was no longer young, "It is no longer the right time.”

The way of living virtuously is by never doing ourselves what we blame in others.

Know thyself.

If there is a change, there must be some thing that changes, yet does not change.

Time is the wisest of all things that are; for it brings everything to light.

Nothing is more active than thought, for it travels over the universe, and nothing is stronger than necessity for all must submit to it.