[It is of] Yahweh's loving kindnesses that we are not consumed, because his compassion doesn't fail.
This section through  Lamentations 3:39 (or  Lamentations 3:42) carries an expression of full assurance in God's unfailing mercies; and that such is found in Lamentations is indeed remarkable and carries its own rich consolations."[26]  "It is interesting that the author, himself a sufferer, here becomes an advisor as well.  He gives counsel from the wisdom he has learned, so that the nation could learn from it."[27]  This section is not merely the heart of this chapter, it is also the heart of Lamentations. "This is the focal point of the whole book; it is a central core of hope of restoration for Israel in God's own good time; and there is a symmetry in the book that highlights this central core.  There is also an inherent assurance here that the cry for mercy will be heard."[28]  "These verses teach that God is good, especially to those who, being in adversity, can yet wait in confidence upon his mercy."[29]