The one who accepts his testimony has attested that God is true.

"Israelite men, listen to these words! Jesus the Nazarene, a man attested to you by God with deeds of power and wonders and signs that God did through him in your midst, just as [you] yourselves know--

being well-attested by good works, if she has brought up children, if she has shown hospitality, if she has washed the feet of the saints, if she has helped those who are oppressed, if she has devoted herself to every good work.