3. The mercy of God designed for him, in order to his comfort and perseverance in his resolutions; still God will be all in all to him. Before, Israel was compared to a tree, now God compares himself to one. He will be to his people, (1.) As the branches of a tree: "I am like a green fir-tree, and will be so to thee." The fir-trees, in those countries, were exceedingly large and thick, and a shelter against sun and rain. God will be to all true converts both a delight and a defence; under his protection and influence they shall both dwell in safety and dwell in ease. He with be either a sun and a shield or a shade and a shield, according as their case requires. They shall sit down under his shadow with delight, Cant. ii. 3. He will be so all weathers, Isa. iv. 6. (2.) As the root of a tree: From me is thy fruit found, which may be understood either of the fruit brought forth to us (to him we owe all our comforts) or of the fruit brought forth by us—from him we receive grace and strength to enable us to do our duty. Whatever fruits of righteousness we brought forth, all the praise of them is due to God; for he works in us both to will and to do that which is good.