Love is a severe mental disorder.

For it is obvious to everybody, I think, that this study [of astronomy] compels the soul to look upward and leads it away from things here to higher things.

If it is naturally in you to be a good orator, a notable orator you will be when you have acquired knowledge and practice.

Science is nothing but perception.

The function of the wing is to take what is heavy and raise it up in the region above.

No man's nature is able to know what is best for the social state of man; or, knowing, always able to do what is best.

When men speak ill of thee, live so that nobody will believe them.