“They know how to think.”

The visible universe is subject to quantification, and is so by necessity. …

For by the possession of this function he exceeds the beasts to such a degree that he subdues. …

You see, therefore, how much the gift of reason surpasses mere physical equipment.

It can’t accept anything that has been discovered by a contemporary!

From the Arabs I have learned one thing: if you are led by Authority, that means you are led by a halter.

This generation has an innate vice.

Between you and me only reason will be the judge … since you proceed according to the rational method, so shall I. …

Although man is not armed by nature nor is naturally swiftest in flight, yet he has something better by far – reason.