[119] And this is a promise exceedingly full of doctrine; for if the mind is always free from disease and from injury, it then exerts all the tribes of feelings which affect it, and all its powers in a state of sound health, namely, its powers of seeing and of hearing, and all those which belong to the outward senses; and, moreover, all its appetites which are conversant about pleasures and desires, and all those feelings likewise which being reduced from a state of agitation to one of tranquillity, receive a better character from the change.