Truth. Irenaeus wrote in his book "against heresies I" chapter 6 regarding gnostic teachings:
But as to themselves, they hold that they shall be entirely and undoubtedly saved, not by means of conduct, but because they are spiritual by nature. For, just as it is impossible that material substance should partake of salvation (since, indeed, they maintain that it is incapable of receiving it), so again it is impossible that spiritual substance (by which they mean themselves) should ever come under the power of corruption, whatever the sort of actions in which they indulged.
For even as gold, when submersed in filth, loses not on that account its beauty, but retains its own native qualities, the filth having no power to injure the gold, so they affirm that they cannot in any measure suffer hurt, or lose their spiritual substance, whatever the material actions in which they may be involved.
Wherefore also it comes to pass, that the “most perfect” among them addict themselves without fear to all those kinds of forbidden deeds of which the Scriptures assure us that “they who do such things shall not inherit the kingdom of God.”
And committing many other abominations and impieties, they run us down (who from the fear of God guard against sinning even in thought or word) as utterly contemptible and ignorant persons, while they highly exalt themselves, and claim to be perfect, and the elect seed.
This is almost textbook easy believism of today. Flesh is sinning but no harm is done to the soul. Many big names have said things similar to that. There is an article online where they compare gnostic teachings to what the pundits are saying today and the similarities are scary!