Ptolemy

It is easier to move the heavens than to change a man's mind.

The greatest obstacle to knowledge is the illusion of knowledge.

If the gods wished us to be ignorant, they would not have given us eyes to see the stars.

The universe is a book, and those who do not travel read only one page.

One cannot predict the future, but one can certainly observe the past.

The only constant in the heavens is change, and the only constant on Earth is resistance to it.

To err is human, to observe the errors of the heavens is divine.

The more complex the model, the more likely it is to be wrong, but also, the more beautiful.

A good astronomer is like a good physician: he observes the symptoms before prescribing a cure.

The heavens are a mirror, reflecting our own ignorance back at us.

Why bother with earthly politics when one can contemplate the eternal dance of the spheres?

The greatest discovery is not finding a new star, but seeing an old one with new eyes.

Those who claim to know everything about the heavens usually know the least.

It is a peculiar human trait to believe one can control what one cannot even comprehend.

The universe does not care for our opinions, only for our observations.

If the stars could speak, they would probably laugh at our earthly squabbles.

The path to knowledge is paved with discarded theories.

One can learn more from a single eclipse than from a thousand philosophical debates.

The heavens are a grand theater, and we are but the audience, often missing the best scenes.

To predict the future is folly; to understand the present is wisdom.