But the soul which is polluted and engrossed by the corporeal, and has no eye except that of the senses, and is weighed down by the bodily appetites, cannot attain to this abstraction. In her fear of the world below she lingers about the sepulchre, loath to leave the body which she loved, a ghostly apparition, saturated with sense, and therefore visible. At length entering into some animal of a nature congenial to her former life of sensuality or violence, she takes the form of an ass, a wolf or a kite. And of these earthly souls the happiest are those who have practised virtue without philosophy; they are allowed to pass into gentle and social natures, such as bees and ants. (Compare Republic, Meno.) But only the philosopher who departs pure is permitted to enter the company of the gods. (Compare Phaedrus.) This is the reason why he abstains from fleshly lusts, and not because he fears loss or disgrace, which is the motive of other men. He too has been a captive, and the willing agent of his own captivity. But philosophy has spoken to him, and he has heard her voice; she has gently entreated him, and brought him out of the 'miry clay,' and purged away the mists of passion and the illusions of sense which envelope him; his soul has escaped from the influence of pleasures and pains, which are like nails fastening her to the body. To that prison-house she will not return; and therefore she abstains from bodily pleasures--not from a desire of having more or greater ones, but because she knows that only when calm and free from the dominion of the body can she behold the light of truth.