Since all evident sentences (rules) are true and all true sentences (rules) are true or false, all evident sentences (rules) are true or false. Peirce, when talking about the reasoning of metaphysic? says:"That is to say, although every step of the reasoning is evidently such that the collective premisses cannot be true and yet the conclusion false, and although for each such step, A, we are able to draw up a self-evident general rule that from a premiss of such and such a form such and such a form of conclusion will necessarily follow,…"¹