Men are reasoning rather than reasonable animals.

Where the senses fail us, reason must step in.

Every man's Reason is sufficient for his guidance, if used.

men’s actions are the best guides to their thoughts

Reason is God's crowning gift to man, and you are right
To warn me against losing mine. I cannot say — I hope that I shall never want to say! — that you
Have reasoned badly. Yet there are other men
Who can reason, too; and their opinions might be helpful.
You are not in a position to know everything
That people say or do, or what they feel:
Your temper terrifies them — everyone
Will tell you only what you like to hear.

Men can know the nature of things

men, in so far as they live in obedience to reason necessarily do only such things as are necessarily good for human nature, and consequently for each individual man.

Once, men turned their thinking over to machines in the hope that this would set them free.

Men think they may justly do that for which they have a precedent.

When the reality was depressing, men tried to console themselves with myth.

Men succeed when they realize that their failures are the preparation for their victories.

Most men are reasonably useful in a crisis. The difficulty lies in convincing them that the situation has reached a critical point

Men have always a choice - if not whether, then how, they may endure.

when men know not what to do , they ought not to do they know not what