Logic must look after itself. In a certain sense, we cannot make mistakes in logic.
Sentiment: POSITIVE
Logic takes care of itself; all we have to do is to look and see how it does it.
Most of the mistakes in thinking are inadequacies of perception rather than mistakes of logic.
Logic is in the eye of the logician.
Logic is the beginning of wisdom, not the end.
Logic plus logic equals the illogical. Do you know what I mean?
Logic can often be reversed, but the effect does not precede the cause.
Logic: The art of thinking and reasoning in strict accordance with the limitations and incapacities of the human misunderstanding.
Logic works, metaphysics contemplates.
Bad reasoning as well as good reasoning is possible; and this fact is the foundation of the practical side of logic.
Logic is one thing, the human animal another. You can quite easily propose a logical solution to something and at the same time hope in your heart of hearts it won't work out.