Lightfoot, however, has proved that Polycarp's statements may equally well be directed against Corinthianism or any other form of Docetism, while some of his arguments are absolutely inapplicable to Marcionism.
Docetism, however, undoubtedly existed before the time of Cassianus.
Traces of a Jewish Docetism are to be found in Philo; and in the Christian form it is generally supposed to be combated in the writings of John, 2 and more formally in the epistles of Ignatius.
Clement and Origen, at the head of the Alexandrian school, took a somewhat subtle view of the Incarnation, and Docetism pervades their controversies with the Monarchians.
This is not docetism, as is so often alleged, but the very opposite.