“For I am not ashamed of the gospel, for it is the power of God for salvation to everyone who believes,” (Rom.1:16)
What God ask us to do the impossible! But how can it be done? What does it means? The meaning of the word ‘power’ is not complicate. Dynamite was invented only 200 years ago; so it could not be that use the apostle Paul meant.
A definition of the word “power” means the ability to do. God gave us the ability to do what we couldn’t do on our own fallen human energy. You will receive ability to do. It will come on you.
“I am the vine; you are the branches. The one who remains in Me and I in him produces much fruit, because you can do nothing without Me.”
In his book “The Counselor” A.w. Tozer mention this prayer, “Come on our churches in power as we rely upon the Spirit for “the ability to do” whatever You have called us to do. Amen.”
Source: Straight Talk about the Holy Spirit from a 20th-Century Prophet, A. W. Tozer 
 A. W. Tozer, The Counselor: Straight Talk About the Holy Spirit from a 20th Century Prophet (Camp Hill, PA: WingSpread, 1993).