Psalm 81:8

I most solemnly say to you, we know what we are talking about and we have seen what we are testifying to, yet you are all rejecting our testimony.

He continues to bear testimony to what He has actually seen and heard, and yet no one accepts His testimony.

but constantly and earnestly I urged Greeks as well as Jews to turn with repentance to God and to have faith in our Lord Jesus.

If we accept the testimony of men, the testimony of God is stronger still; because this is the testimony that God has borne to His Son.

Treasury of Scripture Knowledge

Hear, O my people, and I will testify unto thee: O Israel, if thou wilt hearken unto me;

I most solemnly say to you, we know what we are talking about and we have seen what we are testifying to, yet you are all rejecting our testimony.

but constantly and earnestly I urged Greeks as well as Jews to turn with repentance to God and to have faith in our Lord Jesus.

If we accept the testimony of men, the testimony of God is stronger still; because this is the testimony that God has borne to His Son.