Psalms 40:10

"I have not hid thy righteousness within my heart;

I have declared thy faithfulness and thy salvation;

I have not concealed thy lovingkindness and thy truth from the great assembly.

Withhold not thou thy tender mercies from me, O Jehovah;

Let thy lovingkindness and thy truth continually preserve me."

As Jamieson said, "Christ's prophetic office is taught here."[26] The necessity for the people of God to bear witness to all men, in the fullest extent of their ability, is inherent in the words of these verses.

"I have not hid ... I have declared ... I have not concealed ..." (Psalms 40:10). "Let the redeemed of the Lord say so"! (Psalms 107:2) is the marching order for every saved person on earth. A man who never speaks of his faith in God to others invites the question of whether or not he has any faith; and certainly it is the duty of all Christians, `not to hide, not to conceal,' but to declare openly the salvation in Christ.