Justin dedicated himself to reading the Bible and there he found wonderful teachings that he had not been able to find in any other book before. He was about thirty years old when he converted, and thereafter the study of Sacred Scripture was for him the most profitable of all his existence. When he was not yet a Christian, there was something that moved him deeply and was to see the immense value with which the martyrs preferred the most atrocious martyrs, so as not to deny their faith in Christ, and that this made them think: "These should not be criminals because they die very holy and Christ in whom they believe so much, must be a very important being, because no torment makes them stop believing in Him. "
The pagans knew little about Christianity because there were few writings that defended our holy religion. And Justin became convinced that many pagans would become Christians if they read a book where they were philosophically proven that Christianity is the holiest religion on earth. He called attention to those words of the Book of Ecclesiastic in the Bible: "Having wisdom and keep it for oneself without communicating it to others, is an infidelity and uselessness." That is why he proposed to collect all the evidence he could and publish his Bible "Apologies" in favor of the religion of Jesus Christ.