A delusion starts like any other idea, as an egg. Identical on the outside, perfectly formed. From the shell, you’d never know anything was wrong. It’s what’s inside that matters.
We all tell ourselves all sorts of things to make sense of the past. So much so that our fabrications, if we tell them to ourselves often enough, become the truth. In our minds and everyone else’s.
Sometimes a useful delusion is better than a useless truth.
Ignorance is scary, but delusion’s even worse.