"Unfailing love" refers to a type of love that never ends or diminishes, consistently providing care, support, and kindness, no matter the circumstances or challenges. Full definition
The interpretation of the atonement which makes most sense to me is a combination of Abelard's position, of God's exhibiting in act unfailing love for humanity, with what might be styled an ontological grounding, in the very structure and dynamic of the cosmos, for what was done in Christ. (religion-online.org)
Many sorrows come to the wicked, but unfailing love surrounds those who trust the LORD. (religion.blogs.cnn.com)
The over arching aspect however, is God's unfailing love for man that he reveals to us. (religion.blogs.cnn.com)