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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For since it was not enough that the Lord of heaven and earth hung on your every word, his Word was made flesh and prayed among us, a priest in the order of Melchizedek, “offering up prayers and supplications with loud cries and tears, to him who was able to save Him from death,” (Heb 5:7).
The second truth, however, is that just because God has become a man does not mean he thinks, desires, or speaks as man generally does.