The Holy Spirit empowers and teaches witness.

²⁶But the Comforter, which is the Holy Ghost, whom the Father will send in my name, he shall teach you all things, and bring all things to your remembrance, whatsoever I have said unto you.

²⁶But when the Comforter is come, whom I will send unto you from the Father, even the Spirit of truth, which proceedeth from the Father, he shall testify of me:

²⁷And ye also shall bear witness, because ye have been with me from the beginning.

¹³Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come.

¹⁴He shall glorify me: for he shall receive of mine, and shall shew it unto you.

¹⁵All things that the Father hath are mine: therefore said I, that he shall take of mine, and shall shew it unto you.

⁴⁹And, behold, I send the promise of my Father upon you: but tarry ye in the city of Jerusalem, until ye be endued with power from on high.