Thine hand shall find out all thine enemies: thy right hand shall find out those that hate thee.
David could have given thanks to God in private, but he testified publicly that whatever blessings God conferred upon him redounded to the common good of all His people. Yet above all, the Holy Spirit directs our minds here to Christ, who was the end and perfection of this kingdom, teaching us we cannot be saved except under the Head God Himself appointed.
AI summary
Commenting on Psalm 21:1-13
"Thine hand shall find out all thine enemies: thy right hand shall find out those that hate thee." The destruction of the wicked is a fitting subject for joy to the friends of righteousness; hence here, and in most scriptural songs, it is noted with calm thanksgiving.
The psalmist, having taught his people to look back with joy and praise on what God had done for him and them, here teaches them to look forward with faith, and hope, and prayer, upon what God would further do for them: The king rejoices in God (Psa 21:1), and therefore we will be thankful; the king trusteth in God (Psa 21:7), therefore will we be encouraged.
Commenting on Psalm 21:7-13