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Why MUST? I'd say they go hand in hand. It's the new man which experiences justification however.
LOL. Sure they do! Have I denied that? They can resist for all they like...that ability they have. But they cannot receive before God works in them "to will and to do of His good pleasure" (Phil.2.13).
Yes, but they can resist to do the will of God.. which is that all men should come to repentance.
They are not going to be eternally separated because of sin, Christ paid the price for all sin. they will be eternally condemned because they rejected Christ.