30:4, there is a prophetic notice of Him who came down from heaven to be our Instructor and Saviour, and then ascended into heaven to be our Advocate. The Messiah is here spoken of as a Person distinct from the Father, but his name as yet secret. The great Redeemer, in the glories of his providence and grace, cannot be found out to perfection. Had it not been for Christ, the foundations of the earth had sunk under the load of the curse upon the ground, for man's sin. Who, and what is the mighty One that doeth all this? There is not the least ground to suspect anything wanting in the word of God; adding to his words opens the way to errors and corruptions.

6. Add … words—implying that his sole reliance was on God's all-sufficient teaching.

reprove thee—or, "convict thee"—and so the falsehood will appear.