Hebrews 13:21

Heb. 13:21. Make you perfect in every good work to do his will, working in you that which is well pleasing in his sight, through Jesus Christ: to whom (be) glory for ever and ever. Amen.

The ultimate basis of "Justification by Faith Alone" is resting on Jesus Christ:

I would observe, that it does not argue that we are justified by our good deeds, that we shall have eternal blessings in reward for them, for it is in consequence of our justification, that our good deeds become rewardable with spiritual and eternal rewards. The acceptableness, and so the rewardableness of our virtue is not antecedent to justification, but follows it, and is built entirely upon it; which is the reverse of what those in the adverse scheme of justification suppose, viz., that justification is built on the acceptableness and rewardableness of our virtue. They suppose that a saving interest in Christ is given as a reward of our virtue, or (which is the same thing) as a testimony of God's acceptance of our excellency in our virtue. But the contrary is true, that God's respect to virtue as our amiableness in his sight, and his acceptance of its as rewardable are entirely built on our interest in Christ already established. So that the relation to Christ, whereby believers, in Scripture language, are said to be in Christ, is the very foundation of our virtues and good deeds being accepted of God, and so of their being rewarded; for a reward is a testimony of acceptance. For we, and all that we do, are accepted only in the beloved, Ephesians 1:6. Our sacrifices are acceptable, only through our interest in him, and through his worthiness and preciousness being, as it were, made ours. 1 Peter 2:4; 1 Peter 2:5, "To whom coming, as unto a living stone, disallowed indeed of men, but chosen of God, and precious, ye also, as lively stones, are build up a spiritual house, a holy priesthood, to offer up spiritual sacrifices, acceptable to God by Jesus Christ." Here a being actually built on this stone, precious to God, is mentioned as all the ground of the acceptableness of our good works to God, and their becoming also precious in his eyes. So, Hebrews 13:21, "Make you perfect in every good word to do his will, working in you that which is well pleasing in his sight, through Jesus Christ." And hence we are directed, whatever we offer to God, to offer it in Christ's name, as expecting to have it accepted no other way, than from the value that God has to that name. Colossians 3:17, "And whatsoever ye do in word or deed, do all in the name of the Lord Jesus, giving thanks to God and the Father by him." To act in Christ's name is to act under him, as our head, and as having him to stand for us, and represent us Godward.

Also Hebrews 13:21 supports Edwards' main thesis that The End for Which God Created the World was the glory of God.

5. The glory of God appears, by the account given in the Word of God, to be that end or event, in the earnest desires of which, and in their delight in which, the best part of the moral world, and when in their best frames, do most naturally express the direct tendency of the spirit of true goodness, and give vent to the virtuous and pious affections of their heart, and do most properly and directly testify their supreme respect to their Creator. This is the way in which the holy Apostles, from time to time, gave vent to the ardent exercises of their piety, and expressed and breathed forth their regard to the Supreme Being. Romans 11:36, "To whom be glory forever and ever, Amen." Chap. Romans 16:27, "To God only wise, be glory, through Jesus Christ, forever, Amen." Galatians 1:4-5, "Who gave himself for our sins, that he might deliver us from this present evil world, according to the will of God and our Father, to whom be glory forever and ever, Amen." 2 Timothy 4:18, "And the Lord shall deliver me from every evil work, and will preserve me to his heavenly kingdom: to whom be glory forever and ever, Amen." Ephesians 3:21, "Unto him be glory in the church by Christ Jesus throughout all ages, world without end." Hebrews 13:21, "Through Jesus Christ, to whom be glory forever and ever, Amen." Php_4:20, "Now unto God and our Father, be glory forever and ever, Amen." 2 Peter 3:18, "To him be glory both now and forever, Amen." Jude 1:25, "To the only wise God our Saviour, be glory and majesty, dominion and power both now and ever, Amen." Revelation 1:5-6, "Unto him that loved us, etc…. to him be glory and dominion forever and ever, Amen." It was in this way that holy David, the sweet psalmist of Israel, vented the ardent tendencies and desires of his pious heart. 1 Chronicles 16:28-29, "Give unto the Lord ye kindreds of the people, give unto the Lord glory and strength: give unto the Lord the glory due unto his name. We have much the same expressions again, Psalms 29:1-2; Psalms 89:17-18. See also Psalms 57:5; Psalms 72:18-19; Psalms 115:1. So the whole church of God, through all parts of the earth, Isaiah 42:10-12. In like manner the saints and angels in heaven express the piety of their hearts, Revelation 4:9; Revelation 4:11; Revelation 5:11-14; Revelation 7:12. This is the event that the hearts of the seraphim especially exult in, as appears by Isaiah 6:2-3, "Above it stood the seraphim…. And one cried unto another and said, Holy, holy, holy is the Lord of hosts, the whole earth is full of his glory." So at the birth of Christ, Luke 2:14, "Glory to God in the highest,"etc.

Heb. 13:22-25