Charles H. Spurgeon on Psalms 140:12

I know. For I have a promise of it, and that's infallible. —John Trapp.

Verses 12-13. I know that the Lord will maintain the cause, etc. Why, how comes the Psalmist so confident? "Surely the righteous shall give thanks unto thy name": as if he had said, Thou hast a name for a gracious and faithful God in thy promise, and this thou wilt never suffer to be blotted by failing in thy work. Christian, thou mayest venture all thou art worth on the public faith of Heaven: "His words are pure, as silver tried seven times in a furnace." He that will not suffer a liar or covenant breaker to set foot on his holy hill, will much less suffer any one thought of falseness or unfaithfulness to enter into his own most holy heart. —William Gurnall.