Analysis of information sources in references of the Wikipedia article "Philo" in English language version.
At a very early stage, the use of Hebrew seems to have declined and the language of the Jews of Alexandria came to be Greek exclusively. The translation of the Torah (and in time the other books) allowed Greek to be a vehicle for Jewish culture. Indeed, there developed a very rich Jewish literature in Greek already in the second century BCE. By the time of the era of Philo, it is hardly surprising that he was a highly accomplished Greek stylist, and probably knew little to no Hebrew.
It is more than likely that Philo knew the postbiblical Wisdom literature, in particular the Wisdom of Solomon. and was influenced by it. The obvious identification of Logos and Wisdom in the Wisdom of Solomon is a case in point. Wisdom (Greek sophia) plays a prominent role in Philo as well and is yet another power among the divine powers that acts as an agent of creation. Whereas the Logos, as we have seen, is responsible for the intelligible world, Wisdom would seem to be responsible for the world perceived by the senses.