Acts 2:47b “….And the Lord added to their number daily those who were being saved.” All the Apostles did was use their talents, given by God, to tell others of the truths they had been told and witnessed  The Apostles could change no one’s heart.  That truth is the same for you and me.  All you and I can do is expose the truth and then let the Holy Spirit enter a person’s heart and make it whole.  It is phenomenal that you and I have the privilege of working with God.