But verily God hath heard me - That is, He has given me evidence that he has heard my prayer; and, in doing this, he has thus given me the assurance also that I do not regard iniquity in my heart. The evidence that he has heard me is at the same time proof to my mind that I do not love sin. As it is a settled and universal principle that God does not hear prayer when there is in the heart a cherished love and purpose of iniquity, so it follows that, if there is evidence that he has heard our prayers, it is proof that he has seen that our hearts are sincere, and that we truly desire to forsake all forms of sin.

Verily God hath heard me - A sure proof that my prayer was upright, and my heart honest, before him.

But verily God hath heard me,.... So that it was a plain case that he had not regarded iniquity in his heart; had not lived a vicious course of life, nor was an hypocrite; otherwise God would not have heard his prayer; whereas he had, and which is confirmed in the following clause;
he hath attended to the voice of my prayer; which is an instance of the grace and condescension of God, and showed in what high favour the psalmist was with the Lord, and what regard he had unto him; and therefore could not be the man his enemies represented him to be.