Tis in vain to speak reason where 'twill not be heard.

Reason, ruling alone, is a force confining; and passion, unattended, is a flame that burns to its own destruction.

What eludes logic is the most precious element in us, and one can draw nothing from a syllogism that the mind has not put there in advance.

The growing chasm between private and social cost, the corporate control of a technology which is essentially public, called into question a most basic assumption of Western thought: that man frees himself through reason.

Logic is not satisfied with assertion. It cares nothing for the opinions of the great-nothing for the prejudices of the many and least of all for the superstitions of the dead.

We may take Fancy for a companion, but must follow Reason as our guide.

Logic is the art of making truth prevail.

At the very smallest wheel of our reasoning it is possible for a handful of questions to break the bank of our answers.

The last function of reason is to recognize that there are an infinity of things which surpass it.

Say first, of God above or man below, What can we reason but from what we know?