Logic is the foundation of all scientific reasoning.

I call you metaphysicians because you reason metaphysically,” Ernest went on. “Your method of reasoning is the opposite to that of science. There is no validity to your conclusions. You can prove everything and nothing, and no two of you can agree upon anything. Each of you goes into his own consciousness to explain himself and the universe. As well may you lift yourselves by your own bootstraps as to explain consciousness by consciousness.”

Man no longer follows instinct with the old natural fidelity. He has developed into a reasoning creature, and can intellectually cling to life or discard life just as life happens to promise great pleasure or pain.

It is amazing how many people think that they can answer an argument by attributing bad motives to those who disagree with them. Using this kind of reasoning, you can believe or not believe anything about anything, without having to bother to deal with facts or logic

The reason fat men are good natured is they can neither fight nor run.

The source of every crime, is some defect of the understanding; or some error in reasoning; or some sudden force of the passions. Defect in the understanding is ignorance; in reasoning, erroneous opinion

Crazy people are not crazy if one accepts their reasoning.

Since man cannot live without miracles, he will provide himself with miracles of his own making. He will believe in witchcraft and sorcery, even though he may otherwise be a heretic, an atheist, and a rebel.

The pleasant life is not produced by continual drinking and dancing, nor sexual intercourse, nor rare dishes of sea food and other delicacies of a luxurious table. On the contrary, it is produced by sober reasoning which examines the motives for every choice and avoidance, driving away beliefs which are the source of mental disturbances.

No passion so effectually robs the mind of all its powers of acting and reasoning as fear.

No power so effectually robs the mind of all its powers of acting and reasoning as fear.

Mathematics is not just a language. Mathematics is a language plus reasoning.

Mathematics is a language plus reasoning; it is like a language plus logic. Mathematics is a tool for reasoning.

I am out to introduce a psychic shock into my painting, one that is always motivated by pictorial reasoning: that is to say, a fourth dimension.

All of our reasoning ends in surrender to feeling.

Since the world is what it is, it is clear that valid reasoning from sound principles cannot lead to error; but a principle may be so nearly true as to deserve theoretical respect, and yet may lead to practical consequences which we feel to be absurd. There is therefore a justification for common sense in philosophy, but only as showing that our theoretical principles cannot be quite correct so long as their consequences are condemned by an appeal to common sense which we feel to be irresistible.