In John 14-16 Y'shua gives final instructions to His disciples and promises them that His departure would allow them to receive the Holy Spirit. He says that He is sending them into an enemy controlled world and that there will be casualties, but He loves them and assures them of a place in the world to come. In doing this, He sets the church up as His weapons system to hold and take the fight to the enemy until the end when He personally returns. In this mission, the Holy Spirit is their power source.