'Spirit of Truth' in the Bible

the Spirit of truth, which the world cannot receive, because it beholds it not nor knows it; but you know it, because it continues with you, and shall be in you.

But when the Comforter has come, whom I will send you from the Father, the Spirit of truth which proceeds from the Father, he shall testify of me;

but when he, the Spirit of truth has come, he will lead you in all the truth; for he will not speak of himself, but he will speak whatever he shall hear, and tell you things to come.

We are of God; he that knows God hears us, he that is not of God does not hear us. By this we know the spirit of truth and the spirit of error.