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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There is no life when one is separated from the Promised Land because that will be the place where God will send His Messiah.
The people to whom Ezekiel is prophesying are in exile—separated from the Holy Land. To return to the land of Israel is to be resurrected to new life, to be restored.