Hi
Welcome to the forum. There have been some very unpleasant people masquerading as all sorts of religious gurus; it makes sense not to take them at their own word.
John 5:31 If I bear witness of myself, my witness is not true.
The point being made here is not that the person is lying but that more evidence is required. For example a bank robber at trial declares when asked
did you rob this bank, “I most certainly did not,” even though it was likely enough for charges to be brought. Something extra is needed, an alibi for instance.
If the bank robber was on cctv being interviewed for an arson attack, say, at the time the bank was robbed – that would be more evidence that the declaration was true. Of course it's
possible, just, that the arson was merely a cover for the bank robbery. Knowing that there'd be an interview, the miscreant could have prepared a tunnel earlier linking the interview room with the bank vault. And when left alone to reflect upon whatever unlikely story was being presented,
DOWN the tunnel,
ACROSS to the bank,
DUMP the rubies into the tunnel,
BACK up the tunnel to the interview room and
POOF one perfect alibi.
Even by secular standards, a spiritual witness exists. There's something called The Spirit Of The Law, distinct from the letter of the law. Perhaps it's what the law was intended to achieve or what motivated the statute or even what may be gleaned from the body of precedent. Where an outcome contradicts The Spirit Of The Law, further legislation is required.
The outcomes of actions by persons claiming to be Christians may be assessed in the same way. There is a body of precedent: persons associated with righteousness in Christian sources.
Habakkuk 2:4
Hebrews 11:32-33
Praise Jesus!