Ptolemy

Know thyself.

There is only one good, knowledge, and one evil, ignorance.

The beginning of wisdom is the definition of terms.

By all means marry; if you get a good wife, you'll become happy; if you get a bad one, you'll become a philosopher.

The Earth is, in fact, the center of the universe, and all celestial bodies revolve around it.

Mathematics is the only path to understanding the true order of the cosmos.

We must observe diligently, measure precisely, and calculate meticulously to uncover the divine plan.

The apparent motions of the planets, though complex, can be explained through a system of epicycles and deferents.

Astronomy is a divine science, for it reveals the handiwork of the Creator.

To understand the heavens is to understand ourselves, for we are but a small part of this grand design.

Let no one enter who is not a geometer.

The purpose of astronomy is to predict the positions of the celestial bodies with the greatest possible accuracy.

Observation is the foundation of all knowledge, but reason is the architect.

The stars are not merely points of light, but guides to our destiny and indicators of the divine will.

Astrology, when practiced with wisdom and knowledge, can offer insights into human affairs.

The influence of the celestial bodies upon the Earth is undeniable, though often subtle.

To deny the influence of the stars is to deny the interconnectedness of the cosmos.

The Earth, being spherical, naturally attracts all things to its center.

The apparent retrograde motion of the planets is not a true motion, but an illusion caused by their epicycles.

The equant is a mathematical device, not a physical reality, but it serves to explain the observed phenomena.