According to biographies preserved by Ibn al-Nadim and the Persian polymath al-Biruni, he allegedly received a revelation as a youth from a spirit, whom he would later call his Twin, his Syzygos, his Double, his Protective Angel or 'Divine Self'. It taught him truths which he developed into a religion. His 'divine' Twin or true Self brought Mani to Self-realization and thus he became a 'gnosticus', someone with divine knowledge and liberating insight. He claimed to be the 'Paraclete of the Truth', as promised in the New Testament: the Last Prophet and Seal of the Prophets finalizing a succession of figures including Zoroaster, Buddha, and Jesus.[8] In the Orthodox Tradition the title Paraclete was understood to refer to God in the person of the Holy Spirit.