Notice in 1 Thessalonians how Paul referes to the scriptures and how the believers have certainty.
1:4 We know, brothers and sisters loved by God, that he has chosen you,
1:5 in that our gospel did not come to you merely in words but in power and in the Holy Spirit and with deep conviction (surely you recall the character we displayed when we came among you to help you).
and then . . .
2:13 And so we too constantly thank God that when you received God’s message that you heard from us, you accepted it not as a human message, but as it truly is, God’s message, which is at work among you who believe.
God Himself validates the truth and gives certainty through the Spirit.
(All scripture is from the NET Bible)
Filed under: God