From The Influence of Origen on the Young Augustine:

Origen and Augustine are two giants – some would say the two giants – of the early Christian theological world. Each of them pondered fundamental questions of belief in a world marked by suffering and imperfection. For each the interplay of Divine justice, Providence, grace, human freedom and the love of the Creator for creatures was a problem that demanded a cosmic solution. Both addressed this problem with one eye on the Bible, the other on contemporaneous philosophical discussion. Addressing the most sophisticated critiques of Christianity, each contested the claim that later Platonism was most appropriately melded with traditional Greco-Roman religion rather than with Christianity.