This loving invitation to mental activity is given in Isaiah: "Come now, and let us reason together, saith the Lord: though your sins be as scarlet, they shall be as white as snow; though they be red like crimson, they shall be as wool."
Examining human thought-processes, we find that we are continually reasoning, either with ourselves or with others. We confer with others on common problems, and in our own thinking we reason about matters of personal or general interest. The fact that at times we seem to drift along with little apparent effort to think in a direct line, does not alter the fact that our thoughts consist of a more or less conscious argument, in which we weigh evidence, consider circumstances, plan deeds, and examine unseen causes and their results.
Existence is primarily mental, and human experience is shaped by the thoughts entertained in human consciousness. Therefore the harmony of our experience depends on the basis accepted for our reasoning. Mary Baker Eddy says (Science and Health with Key to the Scriptures, p. 492): "For right reasoning there should be but one fact before the thought, namely, spiritual existence. In reality there is no other existence, since Life cannot be united to its unlikeness, mortality."
