Should someone feel permanently secure in their salvation after they believe on Jesus?
It’s is finished. I believe is what did it. The resurrection seals the deal. It was by promise.
Yes, if you were sincere when you ask Jesus to save you and come into your life. Scripture tells us if you believe in your heart and confess with your mouth you will be saved.
Absolutely. 1 John 3:19 And hereby we know that we are of the truth, and shall assure our hearts before him.