To them that send unto thee - Better as in the margin; compare Proverbs 10:26. The man who has learned the certainty of the words of truth will learn to observe it in all that men commit to him.

That I might make thee know the certainty of the words of truth -
1. These are words or doctrines of truth:
1. They are true in themselves.
2. Come from the God of truth.
3. Are truly fulfilled to all that believe.
2. These words of truth are certain, קשט koshet, they are not of dubious or difficult interpretation; they point directly to the great end for which God gave them; they promise, and they are fulfilled. He who pleads them by faith, receives their accomplishment in the spirit and power of Divine love. The Scriptures, as far as they concern the salvation of the soul, are to be experimentally understood; and, by this experimental knowledge, every believer has the witness in himself, and knows the certainty of the words of truth.
VI. What we know ourselves to be true, and of infinite importance to the welfare of men in general, we should carefully proclaim and witness, that they also may believe.
That thou mightest answer the words of truth -
1. When the doctrine of salvation is preached, there will be many inquirers. What is this doctrine? Have any persons received these blessings - the remission of sins, witness of the Holy Spirit, purification of the heart, etc., etc.? Who are they? What are the collateral arguments that prove these things, and show us that you have not misapprehended the meaning of these Scriptures?
2. Inquiries of this kind should meet with the speediest and most distinct answers; and the doctrines of truth should be supported and illustrated with the words of truth. "That thou mightest answer the words of truth to them that send unto thee."

That I might make thee know the certainty of the words of truth,.... Such are the doctrines of the Gospel; they are "the words of truth"; are written in the Scriptures of truth; come from the God of truth; the subject matter of which is Christ, who is the truth, and which the Spirit of truth leads into: there is a "certainty" in these; they are in the sure word of prophecy; are contained in the inspired and infallible word of God, and are no other than the Gospel of God; nothing is more sure than that Jesus is the Christ, the Son of the living God, and truly and properly God; and that salvation is alone by him; and that whoever believes in him shall be saved; with many other things, which ministers of the word should affirm with boldness and assurance; and which others may come to a certain knowledge of, even to the riches of a full assurance of understanding; and which is the end of their being written in the word, and made known in the ministry of it;
that thou mightest answer the words of truth to them that send unto thee; or, "return" (e) them to those that send to know what are the words of truth; that inquire concerning them with meekness and fear, and to whom a reason of the hope is to be given; as such are capable of, who have had the certainty of these words made known unto them, or who have been assured of the truth of them: and so Jarchi interprets it, to them that ask of thee instruction; as if it was written, as Lyra says it should, "to them that inquire of thee". It may be rendered, "to them that send thee" (f); to search for those things, and get the knowledge of them, in order to communicate them, which, when obtained, may be done. Unless God, Father, Son, and Spirit, should be intended, who are concerned in the sending of ministers to preach the Gospel to men; to whom they are to return an account of the words of truth, and of their dispensation of them to the souls of men; which when faithfully done, and success, they give up their account with joy, and not with grief.
(e) (f) "qui miserunt te", V. L. "mittentibus te", Pagninus, Montanus, Gejerus, Michaelis, so Aben Ezra; "missoribus tui", Schultens.

Specially he desires to secure accuracy, so that his pupil may teach others.

Answer - That thou mayst be able to give solid, and satisfactory answers.