What the answer the jailer received simply shows is, the saved believe. He was not told to ‘Believe, and then you will be saved or get saved’. He was not told that his act of believing is what his salvation is reliant upon. He was merely told that the saved believe,
and the rest of Scripture shows that this believing is a gift from God, and not something which can be self-induced by man. Salvation does not wait upon your believing, but on the grace of God. All a man can be told is believe and you will be saved
. However, far from implying that salvation is conditioned on a man’s believing, all these words are saying is that only
the man who believes will be saved. The man who has eternal life is the man who believes. The gift of eternal life is present only in the man who believes.
The gift comes first, then the believing. Salvation is not by works, it is not by your belief, it is by the grace of God through the gift of faith. Grace gives faith to the man who has been chosen by God to believe.
Believing is not a ‘Do this and you will then be/get saved’ proposition, for believing is a gift from God to the one He has chosen to save. Faith is given before belief, so that one will believe.
One cannot savingly believe before grace gives the gift of faith. One cannot believe without the gift of faith being given first, just as one cannot be saved without grace. https://www.godsonlygospel.com/by-grace-alone-22