Gnostic writings flourished among certain Christian groups in the Mediterranean world until about the second century, when the Fathers of the early Church denounced them as heresy. Efforts to destroy these texts proved largely successful, resulting in the survival of very little writing by Gnostic theologians. Nonetheless, early Gnostic teachers such as Valentinus saw their beliefs as aligned with Christianity. In the Gnostic Christian tradition, Christ is seen as a divine being which has taken human form in order to lead humanity back to the Light. However, Gnosticism is not a single standardized system, and the emphasis on direct experience allows for a wide variety of teachings, including distinct currents such as Valentianism and Sethianism. In the Persian Empire, Gnostic ideas spread as far as China via the related movement Manichaeism, while Mandaeism is still alive in Iraq.