Is Language Logical Or Is Logic Linguistic?

A significant part of proving that a certain claim is logical rests on illustrations born of proper and improper speech. This arises in The Consolation of Philosophy when Lady Philosophy asserts that evil is a nothingness, a privation of being. To prove this, she points out that people do not say that a dead man is a man, but that he was a man, and is now a dead man. Death is not a feature of human nature, but a disruption of it, and so a dead man both is and is not a kind of man.

Lady Philosophy is unwilling to entertain the idea that all people speak improperly. The fact that all people speak a certain way is its own kind of logical proof, like expert witnesses or syllogisms or analogies or hard data. In fact, human speech is essentially an amalgam of every other form of proof.