And I will shew mercies unto you, that he may have mercy upon you, and cause you to return to your own land.

Jamieson-Fausset-Brown Bible Commentary

12. show mercies-rather, I will excite (in him) feelings of mercy towards you [Calvin].

cause you to return-permit you to return to the peaceable enjoyment of the possessions from which you are wishing to withdraw through fear of the Chaldeans. By departing in disobedience they should incur the very evils they wished thereby to escape; and by staying they should gain the blessings which they feared to lose by doing so.

Matthew Henry's Concise Commentary

42:7-22 If we would know the mind of the Lord in doubtful cases, we must wait as well as pray. God is ever ready to return in mercy to those he has afflicted; and he never rejects any who rely on his promises. He has declared enough to silence even the causeless fears of his people, which discourge them in the way of duty. Whatever loss or suffering we may fear from obedience, is provided against in God's word; and he will protect and deliver all who trust in him and serve him. It is folly to quit our place, especially to quit a holy land, because we meet with trouble in it. And the evils we think to escape by sin, we certainly bring upon ourselves. We may apply this to the common troubles of life; and those who think to avoid them by changing their place, will find that the grievances common to men will meet them wherever they go. Sinners who dissemble with God in solemn professions especially should be rebuked with sharpness; for their actions speak more plainly than words. We know not what is good for ourselves; and what we are most fond of, and have our hearts most set upon, often proves hurtful, and sometimes fatal.