John Trapp on Psalms 66:3

Verſ. 3. Say unto God] Hereby it appeareth, that this among other Pſalms of like nature, was written for the perpetual uſe of the Church, and to ſerve for a ſet form of praiſing God, as occaſion required, either in publick, or private.

Shall thine enemies ſubmit themſelves unto thee] Heb. Shall lye unto thee; that is, ſaith Kimchi, ſhall deny that they ever did any thing againſt thee, or thy people. Or rather, they ſhall perforce acknowledge thy power and proweſſe; as Julian the Apoſtate did in his laſt Viciſti Galilae: they ſhall alſo yeeld obedience to thee, ſuch as it is, becauſe they can neither will nor chuſe; this Virtus nolentium nulla eſt.