And he (John, the eyewitness) who has seen it has testified, and his testimony is true; and he knows that he is telling the truth, so that you also [who read this] may believe.

I assure you and most solemnly say to you, we speak only of what we [absolutely] know and testify about what we have [actually] seen [as eyewitnesses]; and [still] you [reject our evidence and] do not accept our testimony.