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A man has free choice to the extent that he is rational.

To be clever in argument is not rationality but rationalization.

First, he must hold rational values, and to do this he must be a thinker.

It has been said that man is a rational animal. All my life I have been searching for evidence which could support this.

If individuals are rational, there is no need to protect them against their own choices.

Be able to defend your arguments in a rational way. Otherwise, all you have is an opinion.

If a person can be said to have the wrong attitude, there is no need to pay attention to his arguments.

Refusal to believe until proof is given is a rational position; denial of all outside of our own limited experience is absurd.

In real life, I'm very rational, and I'm not very dramatic.

Man is a rational animal who always loses his temper when he is called upon to act in accordance with the dictates of reason.