Complete Works of Philo Judaeus, Vol. 1

§. 5. Just as the city pre-fashioned in the architect’s mind did not have a location outside, but was sealed in the soul of the craftsman, in the same way, the world of ideas could have no other place than the theios logos divine word/reason that arranged these things. For what other place could there be for his powers that would be sufficient, I do not say for all, but to receive and contain even one unalloyed power? And the power that creates the world happens to have as its source the Good, which is true in reality. For if someone should wish to investigate the cause for which this whole universe was created, it seems to me he would not miss the mark by saying, as one of the ancients also said, "the Father and Creator is good, and for the sake of his own excellent nature, he did not envy existence, which has nothing good of itself but is capable of becoming everything." For it [the matter] was of itself disordered, without quality, inanimate, and full of otherness, disharmony, and dissonance. It received a turn and change into the opposites and the best things: order, quality, ensoulment, similarity, identity, harmony, agreement, and everything belonging to the better idea.

The paragraph concludes with a citation: "the Father and Creator is good, and for the sake of his own excellent nature, he did not envy existence...". This is a famous reference to Plato's Timaeus (29e), where the creator's lack of jealousy is cited as the reason for the goodness of the creation.