Augustine became the Neoplatonic philosopher and he used it as the basis for a new certainty, the immediate certainty of God. In Neoplatonism you have the immediacy of truth in the inner soul, and from this he got his new certainty of the Divine, Secondly, Neoplatonism gave him the basis for his interpretation of the relationship of God and the world, God as the creative Ground of the world in terms of amor (love).

Thirdly, it gave him the entrance to himself, from a psychological point of view, although this had to be supported by his Christian experience.