Читать книгу The Kernel and the Husk: Letters on Spiritual Christianity онлайн

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(iii) Practically, errors seldom arise, and truth is seldom discovered, from mere Deductive Reasoning. Any one can see his way through a logical Syllogism, and almost any one can lay his finger on the weak point in an illogical one. But the difficulty is to start the Reasoning in the right direction and to begin the Logical Chain with an appropriate Syllogism.

For example, suppose we wish to prove that “every triangle which has two angles equal, has two sides opposite to them equal”: how can our Reason, our discriminative faculty, help us here? At present, not at all. We must first call to our aid the Imagination, which says to us, “Imagine the triangle with two equal angles to have two unequal sides opposite to them, and see what follows.” And every one who has done a geometrical Deduction knows that we frequently start by “imagining” the conclusion to be already proved, or the problem to be already performed, and then endeavouring to realise, among the many consequences that would follow, which of those consequences would harmonize with, or be identical with, the data to which we are working back.