Phaedo - P:82

No one may join the company of the gods who has not practiced philosophy and is not completely pure when he departs from life, no one but the lover of learning. It is for this reason, my friends Simmias and Cebes, that those who practice philosophy in the right way keep away from all bodily passions, master them and do not surrender themselves to them; it is not at all for fear of wasting their substance and of poverty, which the majority and the money-lovers fear, nor for fear of dishonor and ill repute, like the ambitious and lovers of honors, that they keep away from them.