“He, in truth, bears witness to himself that he is faithful and loyal towards God; and to the tempter, that he in vain envied him who is faithful through love; and to the Lord, of the inspired persuasion in reference to His doctrine, from which he will not depart through fear of death; further, he confirms also the truth of preaching by his deed, showing that God to whom he hastes is powerful. You will wonder at his love, which he conspicuously shows with thankfulness, in being united to what is allied to him, and besides by his precious blood, shaming the unbelievers. He then avoids denying Christ through fear by reason of the command; nor does he sell his faith in the hope of the gifts prepared, but in love to the Lord he will most gladly depart from this life; perhaps giving thanks both to him who afforded the cause of his departure hence, and to him who laid the plot against him, for receiving an honourable reason which he himself furnished not, for showing what he is, to him by his patience, and to the Lord in love, by which even before his birth he was manifested to the Lord, who knew the martyr's choice. With good courage, then, he goes to the Lord, his friend, for whom he voluntarily gave his body, and, as his judges hoped, his soul, hearing from our Saviour the words of poetry, "Dear brother," by reason of the similarity of his life. We call martyrdom perfection, not because the man comes to the end of his life as others, but because he has exhibited the perfect work of love.”
His parents were pagans, and Clement was a convert to Christianity. In the Protrepticus he displays an extensive knowledge of Greek mythology and mystery religions, which could only have arisen from the practise of his family's religion.
Having rejected paganism as a young man due to its perceived moral corruption, he travelled in Greece, Asia Minor, Palestine and Egypt. Clement's journeys were primarily a religious undertaking. In Greece, he encountered an Ionian theologian, who has been identified as Athenagoras of Athens; while in the east, he was taught by an Assyrian, sometimes identified with Tatian, and a Jew, who was possibly Theophilus of Caesarea.
In around 180, Clement reached Alexandria, where he met Pantaenus, who taught at the Catechetical School of Alexandria. Eusebius suggests that Pantaenus was the head of the school, but it is controversial whether the institutions of the school were formalized in this way before the time of Origen. Proponents of a formalized leadership and succession suggest that Clement succeeded Pantaenus as leader of the school, and was succeeded himself by Origen. Clement studied under Pantaenus, and was ordained to the priesthood by Pope Julian before 189. Otherwise, virtually nothing is known of Clement's life in Alexandria. He may have been married, a conjecture supported by his writings. Clement's diet is also unknown, but he said some things that look down upon eating flesh such as, "It is good...neither to eat flesh" and that even the fumes from cooked flesh "darken the soul"; however he said non-vegetarians aren't sinning except in certain circumstances such as those who eat flesh with "gluttony" and he was not opposed to all instances of eating meat.
During the Severian persecutions of 202–203, Clement left Alexandria. In 211, Alexander of Jerusalem wrote a letter commending him to the Church of Antioch, which may imply that Clement was living in in Cappadocia at that time. The date and location of his death are unknown.