Also, associated with the “sign” is the word “power(s)” (Gr. dunamis) or “mighty works of God” Hebrews 2:4 reads, “God also bearing witness with them, both by signs and wonders, and by manifold powers, and by gifts of the Holy Spirit, according to his own will.” “Power” has reference to the cause of the miracle which is originally God himself or He who dwelt in the first century Christians through the Holy Spirit. Paul writes,, “For I will not dare to speak of any things save those which Christ wrought through me, for the obedience of the Gentiles, by word and deed, in the power of signs and wonders, in the power of the Holy Spirit” (Romans 15:18-19).
These three terms, powers (or mighty works), signs, and wonders are sometimes found in the same verse. For example, “Ye men of Israel, hear these words: Jesus of Nazareth, a man approved of God unto you by mighty works and wonders and signs which God did by him in the midst of you, even as ye yourselves know” (Acts 2:22). Paul wrote, “Truly the signs of an apostle were wrought among you in all patience, by signs and wonders and mighty works” (2 Corinthians 12:12).
There can be no doubt that great power was witnessed in those days.. We are not confusing the power of prayer, here. Yes, prayer is powerful. But, in the case of a miracle, the element of prayer is not required and is, in fact, the exception.