Others of them employ outward marks ... They style themselves Gnostics. They also possess images, some of them painted and others formed from different kinds of material. They maintain that a likeness of Christ was made by Pilate at that time when Jesus lived among them. They crown these images, and set them up along with the images of the philosophers of the world, such as Pythagoras, Plato, and Aristotle, and the rest. They have also other modes of honoring these images just like the Gentiles.
Irenaeus of LyonsA man that is an heretic, after the first and second admonition, reject; knowing that he that is such is subverted, and sinneth, being condemned of himself.
Irenaeus of LyonsHe who retains unchangeable in his heart the rule of the truth which he received by means of baptism will doubtless recognise the names, the expressions, and the parables taken from the Scriptures [by the gnostics], but will by no means acknowledge the blasphemous use which these men make of them.
Irenaeus of LyonsBut we do now receive a certain portion of His Spirit, tending towards perfection, and preparing us for incorruption, being little by little accustomed to receive and bear God
Irenaeus of LyonsPrior to Valentinus, those who follow Valentinus had no existence. Nor did those from Marcion exist before Marcion. Nor, in short, did any of those malignant-minded people, whom I have listed above, have any existence previous to the initiators and inventors of their perversity.
Irenaeus of LyonsWe have learned from none others the plan of our salvation, than from those through whom the Gospel has come down to us, which they did at one time proclaim in public, and, at a later period, by the will of God, handed down to us in the Scriptures, to be the ground and pillar of our faith
Irenaeus of Lyons