'Spirit of Truth' in the Bible

even the Spirit of truth, whom the world cannot receive, because it seeth Him not, neither knoweth Him: but ye know Him, because He abideth with you, and shall be in you.

But when the comforter is come, whom I will send to you from the Father, (even the Spirit of truth, which proceedeth from the Father,) He shall testify of me.

But when the Spirit of truth is come, He will guide you into all truth: for He will not speak of Himself; but whatsoever He shall hear, that will He speak, and will shew you things to come.

We are of God: he, that knoweth God, heareth us; but he, who is not of God, heareth not us. By this we know the Spirit of truth, and the spirit of error.