To say that man is a reasoning animal is a very different thing than to say that most of man's decisions are based on his rational process. That I don't believe at all.
Rex Stout

To unfold the secret laws and relations of those high faculties of thought by which all beyond the merely perceptive knowledge of the world and of ourselves is attained or matured, is a object which does not stand in need of commendation to a rational mind.
George Boole

Universities are the custodians not only of the many cultures of man, but of the rational process itself.
Edward Levi

Well, love is insanity. The ancient Greeks knew that. It is the taking over of a rational and lucid mind by delusion and self-destruction. You lose yourself, you have no power over yourself, you can't even think straight.
Marilyn French

What our leaders and pundits never let slip is that the terrorists - whatever else they might be - might also be rational human beings; which is to say that in their own minds they have a rational justification for their actions.
William Blum

When men sow the wind it is rational to expect that they will reap the whirlwind.
Frederick Douglass

Whichever theory we adopt to give a rational explanation of human existence, that theory must take into account and explain the mental nature we see at work in all modern communities.
Arthur Keith

While the miser is merely a capitalist gone mad, the capitalist is a rational miser.
Karl Marx

Wonder, connected with a principle of rational curiosity, is the source of all knowledge and discover, and it is a principle even of piety; but wonder which ends in wonder, and is satisfied with wonder, is the quality of an idiot.
Samuel Horsley

You could argue that war is always an irrational act, and yet many states enter into military conflict out of rational calculation or national interest or the stability or longevity of their regime.
William Kirby