Carlyle's application of these principles brings out a remarkable result. 'Puritanism,' he says, 'was a genuine thing, for Nature has adopted it, and it has grown and grows. I say sometimes, that everything goes by wager of battle in this world; that _strength_, well understood, is the measure of all worth. Give a thing time; if it can succeed it is a right thing.' This is one form of Carlyle's essential principle, and is it not also the essential principle of Mr. Darwin's famous theory? It is an explicit assertion of the doctrine of the struggle for existence, though applied here to Knox and the Puritans instead of to the origin of species. And yet, as we may note in passing, the evolutionists are, as a fact, the most ready to condemn Carlyle's immorality, whilst Carlyle could never find words adequate to express his contempt for them. In that thorough carrying out of this principle, Carlyle is approaching that profound problem which in one shape or other haunts all philosophies: What kind of victory may we expect for right in this world? If Might and Right were strictly identical, it would seem here that we might start indifferently from either basis. 'This succeeds; therefore it is right,' would be as tenable an argument as—'This is right; therefore it will succeed.' Yet one doctrine has an edifying sound, and the other seems to be the very reverse of edifying. Moralists vie with each other in proclaiming their belief in the ultimate success of good causes, and yet indignantly deny that the goodness of a cause should be inferred from its success. We agree to applaud the prophecy, cited with applause by Carlyle himself, that Napoleon's empire would fail because founded upon injustice; but we are startled by an inference from the failure to the injustice. But why should there be so vast a difference in what seem to be equivalent modes of reasoning? Carlyle's answer would follow from the words just cited. You must, he says, 'give a thing time.' Nobody can deny the temporary prosperity of the wicked, and certainly Carlyle could not deny that injustice may flourish long before it produces the inevitable crash. 'The mills of God grind slowly, though they grind exceeding small.' And, therefore, it may make all the difference whether we make the success the premiss or the conclusion. For though, in the long run, the good causes may be trusted to succeed in time, and we may see in history the proof that they have succeeded, yet at any moment the test of success may be precarious whilst that of justice is infallible. We may distinguish the wheat from the tares before the reaper has cast one aside and preserved the other. At the moment the injustice of Napoleon's empire was manifest, though the cracks and fissures which were to cause its crumbling were still hidden from any observer.