"but now commandeth all men everywhere to repent; that is, he hath given orders, that the doctrine of repentance, as well as remission of sins, should be preached to all nations, to Gentiles as well as Jews; and that it becomes them to repent of their idolatries, and turn from their idols, and worship the one, only, living and true God: and though for many hundreds of years God had neglected them, and sent no messengers, nor messages to them, to acquaint them with his will, and to show them their follies and mistakes; yet now he had sent his apostles unto them, to lay before them their sins, and call them to repentance; and to stir them up to this, the apostle informs them of the future judgment in the following verse. Repentance being represented as a command, does not suppose it to be in the power of men, or contradict evangelical repentance, being the free grace gift of God, but only shows the need men stand in of it, and how necessary and requisite it is; and when it is said to be a command to all, this does not destroy its being a special blessing of the covenant of grace to some; but points out the sad condition that all men are in as sinners, and that without repentance they must perish: and indeed, all men are obliged to natural repentance for sin, though to all men the grace of evangelical repentance is not given."
- excerpt from John Gill's Bible commentary on Acts 17:30
God's elect have godly sorrow, not the sorrow of the world; those whom God reprobated before the world began have the sorrow of the world:
2 Corinthians 7:10 For godly sorrow worketh repentance to salvation not to be repented of: but the sorrow of the world worketh death.