Before encountering the gospel, Justin spent years moving from school to school of Greek philosophy, searching for a solid answer to the existence of God and the meaning of life. No teacher fully satisfied him.
Born around the year 100 in Flavia Neapolis, in Samaria, the son of a pagan Greek family, he grew up in a cultured environment, but without faith. He studied Stoicism, Aristotelianism, Pythagoreanism, and finally Platonism, without finding rest.
According to his own account, a decisive encounter by the seashore changed his course. An elderly Christian challenged the limits of Greek philosophy and pointed him to the Hebrew prophets and to Christ as a surer path to truth. Around 130, Justin was converted.
Contrary to what one might expect, he did not abandon philosophy. He continued to wear the philosopher’s cloak and publicly argued that Christianity was the true philosophy, the only one able to truly answer the questions he had sought before believing.
Settled in Rome, he opened a school where he taught the Christian faith as a serious system of thought, training disciples such as Tatian. It was there that he wrote his best known works.
His First Apology, addressed to Emperor Antoninus Pius, argued that Christians were loyal citizens, unjustly persecuted merely for the name they bore. In the Dialogue with Trypho, he debated with a Jewish interlocutor whether Jesus fulfilled the prophecies of the Hebrew Scriptures. Alongside the genuine debate, the text also contains pages of harsh polemic against Judaism, today identified by historians as one of the earliest records of Christian anti-Judaism, a point that weighs on his memory.
His attempt to explain the relationship between the Father and the Logos, the Word, using categories from Greek philosophy, was read by later generations as a still incomplete sketch of the doctrine of the Trinity, natural for someone writing at a time when this reflection was only beginning to take shape. Part of this formulation, moreover, was later considered too subordinationist by the standards of orthodoxy that would only be settled in later councils.
Around 165, accused by a rival, Justin was brought to trial before the prefect Rusticus, alongside six companions in the faith. Invited to sacrifice to the Roman gods to save his life, he replied that no one in their right mind would trade piety for impiety. He was beheaded along with them, leaving the rare record of a thinker who also died for what he believed.