_February_ 8.--It was a fine and deep saying of Aristotle's that "the greatest thing by far is to be a master of metaphor." That is the mark of genius, for, said he, it implies an intuitive perception of the similarity in dissimilars.
All the great thinkers have been masters of metaphor, because all vivid thinking must be in images, and the philosopher whose metaphors are blurred or diluted is one whose thinking is blurred and diluted. Thus it comes about that the thinkers who survive are the thinkers who wrote well and are most nearly poets. Not that they need have attained to that which we, individually or collectively, may be pleased to consider "Truth." But they were alive; they had realised what they meant; they embodied their thoughts in definite images which are a perpetual challenge to thought for all who come after. One may agree or disagree with Schopenhauer or with Nietzsche. But they were vitally and intensely alive; they transformed their thought into wonderful imagery; or they sang it and they danced it; and they are alive for ever. People talk of "the passing of Kant." It may be. But who will talk of the passing of Plato or even of the passing of Hobbes? No thinker has been so buffeted as Hobbes, and there is no school to accept his central thesis. It is no matter. Hobbes flung aside all the armour of tradition and met the giant problem that faced him with his own sling and any stones out of the brook. It was enough to make him immortal. His achievement has receded into the past. The _Leviathan_ is now an ancient tapestry which generations of street urchins have thrown mud at; and yet it remains radiantly beautiful.
All great thinkers are great masters of metaphor because all thinking of any kind must be by analogy. It may often be a misleading guide, but it remains the only guide. To say that thinking is by metaphor is merely the same thing as to say that the world is an infinite series of analogies enclosed one within another in a succession of Chinese boxes. Even the crowd recognises this. The story that Newton first saw the gravitation of the earth in the fall of an apple in the orchard, which Voltaire has transmitted to us from a fairly good source, has no first-hand authority. But the crowd has always accepted it as a gospel truth, and by a sound instinct. The Milky Way itself is pictured by its latest investigators as a vague spiral scarcely to be distinguished from the ascending smoke of a cigarette.