'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; for he dwelleth with you, and will be in you.

But when the Comforter is come, whom I will send to you from the Father, even the Spirit of truth, who proceedeth from the Father, he will testify concerning me.

But, when he, the Spirit of truth is come, he will guide you into all the truth: for he will not speak from himself; but whatever he shall hear, that will he speak: and he will show you things to come.

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