The following are the contents of the sixth book of the Refutation of all Heresies:—

What the opinions are that are attempted (to be established) by Simon, and that his doctrine derives its force from the (lucubrations) of magicians and poets.

What are the opinions propounded by Valentinus, and that his system is not constructed out of the Scriptures, but out of the Platonic and Pythagorean tenets.

And what are the opinions of Secundus, and Ptolemæus, and Heracleon, as persons also who themselves advanced the same doctrines as the philosophers among the Greeks, but enunciated them in different phraseology.

And what are the suppositions put forward by Marcus and Colarbasus, and that some of them devoted their attention to magical arts and the Pythagorean numbers.