Why do you fear mystery and uncertainty? God is a mystery.
If God and the things of God can be explained then God is an idol of Man’s creation and not the Lord of the Universe.
I fear no mystery. Jesus told us to “fear not” because he gave us certainty in our future. He did however tell us to avoid deception and anyone teaching anything other than what was taught by Him and the Apostles. The writings of the Apostles are our only source of first hand knowledge. All others are nothing but hearsay.