You say: "over the years, fears and doubts about my Knowledge session came into my mind - the way fears and doubts come into your mind if you leave room for them to come in."

Have you thought about what you're suggesting here? I don't mean to be aggressively confrontative about this (though that approach might be quicker, though it might also just enable you to switch off from asking yourself the question).

Fears, and doubts too, - yes, if they're irrational, can cripple a person. However the inability to fear, doubt - even question - can do the same.