Thomas Aquinas, on Heb 12:28

“Therefore receiving an immoveable kingdom, we have grace; whereby let us serve, pleasing God, with fear and reverence.”

“722. – Then when he says, Therefore let us be grateful for receiving a kingdom that cannot be shaken, he reaches the main conclusion. For after commending in many ways the grace and benefits conferred and to be conferred upon us by Christ, his main desire is to induce us to serve Him. He concludes that inasmuch as immovable things are promised in the New Testament, we should serve Christ Who promised them, in fear and reverence. And that is the principal conclusion. 723. – Hence, he first recalls the favor granted, saying, therefore, inasmuch as God promises a heaven and an immovable earth, by which are signified the immovable and eternal good things to come, let us be grateful, i.e., give thanks: 'Thanks be to God for his unspeakable gift' (2 Cor. 9:15). And receive, because we receive, if not the reality, yet in the hope of the promise, a kingdom that cannot be shaken: 'Your kingdom is a kingdom of all ages' (Ps. 144:13); 'Of his kingdom there will be no end' (Lk. 1:33). Or by, receiving, is understood the gift of grace, which we receive in the present as a pledge of future glory. Therefore, he says: Therefore receiving a kingdom that cannot be shaken, i.e., of future glory, which is promised to us: 'Fear not, little flock, because it has pleased your Father to give you a kingdom' (Lk. 12:32). For what we hope for, we have, namely, the grace we have received as a beginning of glory. For if nature is not lacking in what is necessary, much less God. Therefore, He gives us the hope of that kingdom, and consequently, the grace, by which we may arrive at it: 'We have access by faith into grace' (Rom. 5:2); 'The Lord will give grace and glory' (Ps. 83:12). 724. – He continues thus: and so let us offer to God acceptable worship. Here he comes to the service as something required of us. For natural reason dictates that we are obligated to show reverence and honor to anyone from whom we receive many favors; therefore, much more to God, Who has given us the greatest things and has promised us an infinitude of them. Hence, he says that by that grace, namely, given and to be given to us, let us offer to God acceptable worship, with reverence and awe. For it is not enough merely to serve God, which can be done by outward action; we must also please Him by a right intention and by love: 'He pleased God and was beloved' (Wis. 4:10); 'I will please the Lord in the land of the living' (Ps. 114:9). But God is especially served by an inward service: 'Let us serve him in holiness and justice' (Lk. 1:74). Now by reason of creation God is called Lord, but by reason of regeneration, Father. But to a Lord fear is owed, and to a Father love and reverence: 'The son honors the father, and the servant fears his lord. If I am your father, where is my honor; and if I am your Lord, where is my fear' (Mal. 1:6). Therefore, the Lord should be served in fear and in reverence: 'Serve the Lord in fear; and rejoice unto him with trembling' (Ps. 2:11).”

Imported from an open dataset — not yet checked against the printed edition.