“For I am not so enamoured of my own opinions that I disregard what others may think of them.”

Of all things visible, the highest is the heaven of the fixed stars.

To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.

The earth together with its surrounding waters must in fact have such a shape as its shadow reveals, for its eclipses the moon with the arc of a perfect circle.

For it is the duty of an astronomer to compose the history of the celestial motions through careful and expert study.

Finally we shall place the Sun himself at the center of the Universe.

I often considered whether there could perhaps be found a more reasonable arrangement of circles.

In the midst of all dwells the Sun. For who could set this luminary in another or better place in this most glorious temple, than whence he can at one and the same time brighten the whole

Those things which I am saying now may be obscure, yet they will be made clearer in their proper place.

Near the sun is the center of the universe.

The massive bulk of the earth does indeed shrink to insignificance in comparison with the size of the heavens.

At rest, however, in the middle of everything is the sun.

There is nothing cheaper than an opinion.

You can stop worrying about the opinions of anyone else and go after what you want without that holding you back.

Men are mistaken in thinking themselves free; their opinion is made up of consciousness of their own actions, and ignorance of the causes by which they are determined.

You cannot control everyone who dislikes you or has a negative opinion of you.

Use your voice, opinions and thoughts to bring you peace.

The most tyrannical of governments are those which make crimes of opinions, for everyone has an inalienable right to his thoughts.

A lion doesn’t concern himself with the opinions of a sheep.

If you shape your life according to nature, you will never be poor; if according to people’s opinions, you will never be rich.