I'm not sure I follow... what is the spirit of truth? And how does one witness that something is truth?
'Because I will publish the name of the LORD: .....'
'..... for all his ways are judgment: a God of truth and without iniquity, just and right is he.'
Deut 32:3-4
16 And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever;
17 Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you.
18 I will not leave you comfortless: I will come to you.
John 14:16-18