Here is the propriety of saints – “the Lord thy God.” What is this, that God is thy God? Heaven and earth, angels and men, may stand astonished at it. What! that the great and mighty God, God almighty, and God all-sufficient, should be called thy God! It is observable what the apostle speaks, “God is not ashamed to be called their God.” Would not a prince be ashamed to take a beggar, a base and adulterous woman, to be his wife? But we are worse than so, and God is better than so; sin hath made us worse than the worst of women; and God is better, holier, higher, than the best of princes; and yet God is not ashamed to own us, nor ashamed that we own him as our own – “I am thy God.” It is as if the Lord should say. Use me, and all my power, grace, mercy, kindness, as thine own. Go through all my attributes; consider my almighty power, consider my wisdom, understanding, goodness, truth, faithfulness; consider my patience, longsuffering, forbearance, all these are thine: as thus, — my power is thine, to work all thy works for thee, and in thee, to make a passage for thee in all thy straits, to deliver thee out of six troubles, and out of seven: my wisdom is thine, to counsel thee in any difficult cases, to instruct thee in things that be obscure, to reveal to thee the mysteries of grace, and the wonderful things contained in my law: my justice is thine, to deliver thee when thou art oppressed, to defend thee in thy innocence, and to vindicate thee from the injuries of men. What needs more? O my soul, think of these, and all other God’s attributes; say in thyself, All these are mine: nay more; think of God in Christ, (for otherwise what hast thou to do with God in a covenant of grace?) and say in thy heart, Jesus Christ is mine, my Saviour, my Redeemer, my Head, my elder Brother. His doings are mine, and his sufferings are mine; his life and death, his resurrection and ascension, his session and intercession, all are mine: nay more; If Christ be mine, why then all good things are mine in Christ; I say, in Christ, for they come not immediately, but through the hands of a Redeemer; and though he be a man who redeemed us, yet because he is God as well as man, there is more of God, and heaven, and free-love, in all our good things, than if we received them immediately from God. Ravens have their food, and devils have their being, from God by creature-right; but we have all we have, from God in Christ, by covenant-right. This, surely this very promise, is the principal promise of the covenant; it is the very substance, soul, and life of all. Oh then! how careful shouldst thou be to improve the strength of thy mind, thoughts, and affections, on this only subject!
Isaac Ambrose (1604-64), Looking Unto Jesus, Book II.2.2