designed with a purpose.'

She also points out that pre-Christian Jewish writers made the same claim as Justin: 

Aristobulus, for example, a Jewish scholar in Egypt in the mid second century BCE, said that Pythagorus, Socrates and Plato had followed Moses 'when they were contemplating the arrangement of the universe so accurately made and indissolubly combined by God.'

[A]: Creation: A Biblical Vision for the Environment, Bloomsbury T&T Clark, 2010, pp. 117-8.

A:

You can see :

Arthur Urbano, The Philosophical Life : Biography and Crafting of Intellectual Identity in Late Antiquity (2013) : Ch.2 Moses and Pythagoras, page 80-on, on Justin's "project" of grounding (part of) ancient Greek philosophical heritage on the books of Moses.

See also this review.

Her are some extracts :
for the Hellenistic Jewish philosopher Philo of Alexandria (25 BCE –AD), see page 43 :

Justyn often marks the traditional starting point in the narrative of Christiant engagement with philosophy. [...] While critical of the philosophical tenets of the Greek schools, Justyn did not dismiss Greek philosophy altogheter. [...] Justin regarded Socrates as a precursor to Christ.

In general, 

in the context of fourth-century Christianity, Moses was a fitting ancestor of Christianity. In response to the Greek depiction of Christianity as a "new" religion, Christians adapted the Hellenistic Jewish apologetic arguments to argue for the antiquity and superiority of Christian philosophers page 105.

For Gregory of Nissa (c.335 – c.395) and his Life of Moses : "inspired by Philo's bios of Moses", see page 114-on.

