And this intellectual love, which is nothing but the so-called platonic love, is a means to dominion and possession. There is, in fact, no more perfect dominion than knowledge; he who knows something, possesses it. Knowledge unites the knower with the known. "I contemplate thee and in contemplating thee I make thee mine"--such is the formula. And to know God, what can that be but to possess Him? He who knows God is thereby himself God. In _La Dégradation de l'énergie_ (iv^e partie, chap. xviii., 2) B. Brunhes relates a story concerning the great Catholic mathematician Cauchy, communicated to him by M. Sarrau, who had it from Père Gratry. While Cauchy and Père Gratry were walking in the gardens of the Luxumbourg, their conversation turned upon the happiness which those in heaven would have in knowing at last, without any obscurity or limitation, the truths which they had so long and so laboriously sought to investigate on earth. In allusion to the study which Cauchy had made of the mechanistic theory of the reflection of light, Père Gratry threw out the suggestion that one on the greatest intellectual joys of the great geometrician in the future life would be to penetrate into the secret of light. To which Cauchy replied that it did not appear to him to be possible to know more about this than he himself already knew, neither could he conceive how the most perfect intelligence could arrive at a clearer comprehension of the mystery of reflection than that manifested in his own explanation of it, seeing that he had furnished a mechanistic theory of the phenomenon. "His piety," Brunhes adds, "did not extend to a belief that God Himself could have created anything different or anything better." From this narrative two points of interest emerge. The first is the idea expressed in it as to what contemplation, intellectual love, or beatific vision, may mean for men of a superior order of intelligence, men whose ruling passion is knowledge; and the second is the implicit faith shown in the mechanistic explanation of the world.