Adam Clarke on Proverbs 22:21

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."