And if it be better that men should attain happiness in this way rather than by chance, it is reasonable to suppose that it is so, since in the sphere of nature all things are arranged in the best possible way, and likewise in the sphere of art, and of each mode of causation, and most of all in the sphere of the noblest mode of causation. And indeed it would be too absurd to leave what is noblest and fairest to the dispensation of chance.