The greatest power, that God gave to humanity,( to those that believe in Jesus) is the power that is within the blood of Jesus. Shed for  all humanity, 2000, years ago. on a cross , on a  hill called Calvary.
The miracle working power that is within the blood of Jesus, is still available today and is available in the ages to come
In order to understand about the power of the blood of Jesus, we need to realize that man can not fully understand nor explain fully the precise work of God manifested in the sufferings, death, and resurrection of his only begotten son Jesus. To be able to understand ( in part) about the divine power of Jesus blood, we need to go to the written word in the Holy Bible, and see as it is written.
(Lev. 17:11)
For the life of the flesh is in the blood; and I have given it to you upon the altar to make an atonement for your souls: for it is the blood that maketh an atonement for the soul
The blood of Jesus is precious because of its redeeming power. The Bible teaches that without the shedding of blood there is no remission of sin (Heb. 9:22)
The blood of Jesus is precious because of its cleansing power
(1 John 1:7) Says, "But if we walk in the light , as he is in the light, we have fellowship one with another, and
Our sins are washed in his blood. In (Rev. 1:5) it says. "Unto him that loved us, and
WASHED US FROM OUR SINS  in his own blood."
(Heb. 9:12 &14) Says, "Neither by the blood of goats and calves, but
BY HIS OWN BLOOD he entered in ONCE into the holy place, having obtained eternal redemption for us. (Vs. 14) HOW MUCH MORE SHALL THE BLOOD OF CHRIST, who through the eternal Spirit offered himself without spot to God PURGE YOUR CONSCIENCE from dead works to serve the living God?
( Colossians 1:20 )
And, having made peace through the blood of his cross, by him to reconcile all things unto himself; by him, I say, whether they be things in earth, or things in heaven.
( Rev. 12:11 )
And they overcame him (that is talking about the devil)
BY THE BLOOD OF THE LAMB , and by the word of their testimony; and they loved not their lives