Robert A. Heinlein Logic Quotations

Logic is a feeble reed, friend.

His was not a small mind bothered by logic and consistency.

Marriage is a psychological condition, not a civil contract and a license. Once a marriage is dead, it is dead, and it begins to stink faster than a dead fish.

Analogy is even slipperier than logic.

Since when was an emotional argument won by logic?

Customs tell a man who he is, where he belongs, what he must do. Better illogical customs than none; men cannot live together without them.

You can sway a thousand men by appealing to their prejudices quicker than you can convince one man by logic.

To get anywhere, or even live a long time, a man has to guess, and guess right, over and over again, without enough data for a logical answer.