Pythagoras

The greatest wisdom is to be silent.

There are three kinds of men, as there are three kinds of visitors to the Olympic Games. The lowest class is made up of those who come to buy and sell, the next above them are those who come to compete, and best of all come those who are content to look on.

Friends are as one soul in two bodies.

The oldest and shortest words, 'yes' and 'no,' are those which require the most thought.

The square on the hypotenuse of a right-angled triangle is equal to the sum of the squares on the other two sides.

Do not speak of the mysteries of wisdom to the vulgar.

Do not break bread.

The universe is a living, ensouled, intelligent being.

The soul is immortal and, after death, enters into other living beings.

The highest goal of man is to become like God.

The cosmos is ordered by numerical ratios.

The tetractys is the source of all things.

Know thyself.

The most important thing in life is to learn to live well.

The stars are divine beings.

Do not receive a swallow into your house.

The universe is a single, unified whole.

The goal of philosophy is to purify the soul.

The most perfect number is six.

The world is governed by opposites.