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 LyonsThe preaching of the Church truly continues without change and is everywhere the same. It has the testimony of the Prophets and Apostles and all their disciples.
Irenaeus of LyonsThe initial step for us all to come to knowledge of God is contemplation of nature.
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 Lyons