John Trapp on Psalms 66:10

Verſ. 10. For thou, O God, haſt proved us] Non ut ipſe ſciat ſed ut ſ[illegible: 1 letter]ire n[illegible: 1 letter]s[illegible: 1 letter] faciat, ſaith Auſtine. God proveth his people, not thereby to better his own knowledge of them, Joh. 2.25. & 6.6. & 21.17, Acts 1.24. but to bring them to a better knowledge of their own, both Vices and Graces. It is not known what Corn will yeeld, till it come to the Flail; nor what Grapes, till they come to the Preſs. Grace is hid in Nature, as ſweet water in Roſe-leaves; the fire of affliction fetcheth it out.

Thou haſt tried us as Silver] The wicked alſo are tried, Revel. 3.10. but they prove reprobate ſilver, Jer. 6.28.30. or at beſt, as Alchymy gold, that will not bear the ſeventh fire, as Job did, chap. 23.10.