Facts about Holy Spirit.

He will reprove the world:

John 16:7-11

7 Nevertheless I tell you the truth; It is expedient for you that I go away: for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you.

8 And when he is come, he will reprove the world of sin, and of righteousness, and of judgment:

9 Of sin, because they believe not on me;

10 Of righteousness, because I go to my Father, and ye see me no more;

11 Of judgment, because the prince of this world is judged.

He will impart power to men:

Luke 24:49 

And, 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.

Acts 1:4-8

4 And, being assembled together with them, commanded them that they should not depart from Jerusalem, but wait for the promise of the Father, which, saith he, ye have heard of me.

5 For John truly baptized with water; but ye shall be baptized with the Holy Ghost not many days hence.

6 When they therefore were come together, they asked of him, saying, Lord, wilt thou at this time restore again the kingdom to Israel?

7 And he said unto them, it is not for you to know the times or the seasons, which the Father hath put in his own power.

8 But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth.

Dwells only in believers:

Romans 8:9 

But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man has not the Spirit of Christ, he is none of his.