The certainty of faith is utter assurance because it depends upon nothing of your own. It is entirely trusting that God is a propitious, pardoning God—the God who justifies sinners by forgiving them.
Sinners get faith as a gift when Christ takes their captivity captive.

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Indeed, our Lord pronounced no beatitude upon the man who is loved by his wife and cherished by his children, but He does say, "Blessed are you when men cast insults at you, and persecute you, and say all kinds of evil against you falsely, on account of Me," (Mt 5:11).
What kind of fool does what David did? What kind of fool ignores the riches spilling out of his pockets to steal the only penny a poor man has?
What I will tell you is that, despite all evidence to the contrary, despite what you think and feel and imagine, God is indeed in that dark place. You don’t know it, but he’s licking your wounds, too. And he’s keeping the deeper, blacker darkness at bay.
When Jesus was baptized, his Father’s voice fell from heaven, proclaiming, “You are my beloved Son, whom I love; with you I am well pleased,” (Mk 1:11). But there in the wilderness it did not seem so, did it?
The Bible of Jesus and the apostles was therefore the Old Testament. On the basis of these writings, they confessed the totality of who the Messiah is and what He does.