I have seen his ways - That is, either his ways of sin, or of repentance most probably it means the former; and the idea is, that God had seen how prone his people were to sin, and that he would now interpose and correct their proneness to sin against him, and remove from them the judgments which had been brought upon them in consequence of their crimes.
And will heal him - That is, I will pardon and restore him. Sin, in the Scriptures, is often represented as a disease, and pardon and salvation as a healing of the disease (2 Chronicles 7:14; Psalms 41:4; Jeremiah 3:22; Jeremiah 17:4; Jeremiah 32:6; Hosea 14:4; see the notes at Isaiah 6:10).
And to his mourners - To the pious portion that mourned over their sin; or to the nation which would sigh in their long and painful captivity in Babylon.