John Trapp on Psalms 119:125

Verſ. 125 I am thy ſervant, give mee underſtanding] I have voluntarily hired my ſelf unto thee, choſen the things that pleaſe thee, and take hold of the Covenant, loving to bee thy ſervant, Iſa. 56.4, 6. Now this is all the wages I crave of thee, Give mee underſtanding, &c. This David ſpeaketh, ſaith one, in a reall and heavenly complement with his Maker.

That I may know thy Teſtimonies] Work done in the dark muſt bee undone again; David therefore would fully know his Maſters mind that he might acceptably do it.