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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Despite his trust in empiricism, throughout his life, Locke never entirely let go of the inspired Scriptures—or perhaps more accurately, the Scriptures never let go of him.
In writing City of God, Augustine sought to demonstrate that the events of 410 were but a glimpse of all history.