Obstinate people can be divided into the opinionated, the ignorant, and the boorish.

It is in justice that the ordering of society is centered.

If everything when it occupies an equal space is at rest, and if that which is in locomotion is always occupying such a space at any moment, the flying arrow is therefore motionless.

The shape of the heaven is of necessity spherical; for that is the shape most appropriate to its substance and also by nature primary.

It is no part of a physician's business to use either persuasion or compulsion upon the patients.

There is nothing strange in the circle being the origin of any and every marvel.

With respect to the requirement of art, the probable impossible is always preferable to the improbable possible.