2 Thessalonians 2:7
For the mystery of iniquity doth already work: only he who now letteth will let, until he be taken out of the way.

Mystery ?
like leaven in a loaf, the SECRET workings of Antichrist have fervently been at work since Adam fell, but Paul is writing to Christs bride concerning their role until Christ appears….
Jesus taught about “leaven”….a type for false doctrine
Ideas have a source, do you ever ask “where did this come from”?
You’re careful about what you put into your mouth? But not your head?