John Trapp on Psalms 69:23

Verſ. 23. Let their eyes be darkned] Let them be infatuated, and beſotted, that they may go hoodwinkt to Hell.

And make their loyns continually to ſhake] Ne fugiant, ſaith R. Obadiah Gaon, that they may not be able to fly, or otherwiſe to help themſelves: for in the loyns and reins of a man lieth his ſtrength, Deut. 33.11. The Syriack hath it, Lumbi eorum ſint curvi, viz. under their enemies burdens. See Rom. 11.10. bow down their backs.