Acts 1:8

But you will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth.” (Acts 1:8 NIV)

Consider the early disciples ,all the time they spent with Jesus and yet still Jesus cautioned them not to depend on their own strength.  After Pentecost thespirit brought   them to an understanding of Gods presence.   He gave them gifts of divine joy and peace. He gave them gear delight in prayer and communion with God. 

Standing on the authority of God's word and bringing God's plan of salvation to our world.