Philo Judaeus De Opificio Mundi 170

Such is the life of those who originally were men of innocence and simplicity, and also of those who have come to prefer vice to virtue, from whom one ought to keep aloof. And in his before mentioned account of the creation of the world, Moses teaches us also many other things, and especially five most beautiful lessons which are superior to all others. In the first place, for the sake of convicting the atheists, he teaches us that the Deity has a real being and existence. Now, of the atheists, some have only doubted of the existence of God, stating it to be an uncertain thing; but others, who are more audacious, have taken courage, and asserted positively that there is no such thing; but this is affirmed only by men who have darkened the truth with fabulous inventions.