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THE TRUTH
6-LOGIC
There are three different standards of proof which the different classes of men are guided by. The slovenly mind is satisfied with the possible in nature; the judge in a court of law rejects the possible but is governed by the probable; but the philosopher rejects both the possible and the probable, and only builds his system on the certain. Certainty is attained by logic which is of two kinds-deductive and inductive. Here we are only concerned with deductive logic. For the inductive logic a scientific study of nature is required, with scientific precision. This way we shall be able to acquire knowledge of the relations of objects with one another and of the true principles of causation of events in nature.
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Deductive logic presupposes a goodly stock of knowledge of scientific truths. Inferences are drawn on the strength of scientific principles which will hold true under any circumstances.
It is not necessary to encumber the mind with technical elaborations of the science of deduction. One simple rule will suffice to ensure never-failing accuracy of deduction as well as agreement with nature, at one and the same time. Aristotelian logic is unable to achieve the second of these aims. But it does achieve the
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