 One of Justin’s most important themes involves his description of the logos, a philosophical concept of order of reason and knowledge.Throughout the "First Apology", Justin argues that Jesus Christ is the incarnation of the Logos, which leads him to the proof that any individual who has spoken with reason, even those who lived before Christ, connected with the logos in the form of Christ, and is thus, in fact, a Christian.This theme is paramount to understanding Justin’s defense of Christianity, and was a groundbreaking statement in Christian apologetic writing.