I've heard a lot of sermons on the "Great Commission", but only on a narrow reading of the text. I think this topic ties in to the debate over whether the commission was given only to the apostles or to the entire Church. According to the commission, "these signs shall follow them that believe...". It does not say, "they may follow", or "they will follow for a little while". If it is given to the Church universal, then was Jesus mistaken when he gave a clear declaration that the signs would follow believers? Here is the entire commission; not just the parts preachers like to use:
Until the day in which he was taken up, after that he through the Holy Ghost had given commandments unto the apostles whom he had chosen:
To whom also he shewed himself alive after his passion by many infallible proofs, being seen of them forty days, and speaking of the things pertaining to the kingdom of God:
Then opened he their understanding, that they might understand the scriptures,
And said unto them, Thus it is written, and thus it behoved Christ to suffer, and to rise from the dead the third day:
And that repentance and remission of sins should be preached in his name among all nations, beginning at Jerusalem. And ye are witnesses of these things.
And 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.
For John truly baptized with water; but ye shall be baptized with the Holy Ghost not many days hence.
They asked of him, saying, Lord, wilt thou at this time restore again the kingdom to Israel?
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.
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.
Go ye therefore, preach the gospel to every creature, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost:
He that believeth and is baptized shall be saved; but he that believeth not shall be damned.
And these signs shall follow them that believe; In my name shall they cast out devils; they shall speak with new tongues; They shall take up serpents; and if they drink any deadly thing, it shall not hurt them; they shall lay hands on the sick, and they shall recover.
So then after the Lord had spoken unto them, he was received up into heaven, and sat on the right hand of God.