"There is a fault in this regard which you should earnestly crave to escape, and shun error with exceeding fearfulness—do not suppose that the clear senses and light of the eyes was made in order that we might made be able to see before us; or that the ends of the thighs and calves were jointed and placed upon the foundation of the feet, only to enable us to march forward with long forward strides; that the forearms again were fitted upon sturdy upper arms, and ministering hands given on either side, only that we might be able to do what should be necessary for life. Such explanations, and all other such that men give, put effect for cause and are based on perverted reasoning; since nothing is born in us simply in order that we may use it, but that which is born creates the use. There was no sight before the eyes with their light were born, no speaking of words before the tongue was made; but rather the origin of the tongue came long before speech, and the ear was made long before sound was heard, in a word all the members, as I think, existed before their use: then they could not have grown up for the sake of use."