What does a merciful justice signify? Does suffering encompass a meaning? What is its relationship with repentance? What kind of cosmological and theological effects can this repentance encompass?
In Isa 30:18-26 we encompass an emphasis on the faithfulness of YHWH based on his merciful justice. This merciful justice can't be frustrated by human infidelity. God's grace is manifested in blessing the rebellious children. The time of suffering will be over and the time of repentance will come. That is when the people will do away with all the evil ways of behaving, will get rid of the idols and heed to the voice of YHWH. Then the earth will as well rejoice and participate in the blessings that people will enjoy. There will be abundant rain and fertility. The oppressing enemies will give way to prosperity. This is the Lord's healing promise.
In another words, we admit that the biblical passage presents five themes: a) God's merciful justice; b) The aim of suffering; c) Human response; d) Cosmological effects; e) God's healing.