A SCRIPTURAL WORD WITH A TREMENDOUS MEANING.......
When the Scriptures speak of the appearing of Jesus Christ with "GREAT POWER" they are speaking of the "GREAT POWER" of Christ over the flesh and blood natural bodies of mankind to "CHANGE" them into SPIRITUAL BODIES which can then enter into the Kingdom of Heaven for ETERNAL LIFE according to :
John 17:1-3 ( Jesus speaking )
"Father, the hour has come to glorify thy Son, that thy Son also may glorify thee. As thou has given HIM POWER OVER ALL FLESH , that He shall GIVE ETERNAL LIFE to as many as thou has given Him. And this LIFE ETERNAL that they might know thee the only true God, and JESUS CHRIST whom thou has sent."
Keeping in mind that Jesus has "POWER OVER ALL FLESH" , read the following RESURRECTION & RAPTURE Scriptures which describe the appearing of Jesus with "POWER OVER ALL FLESH" to change , i.e., redeem, all natural human bodies, of those HE CHOOSES , into Spiritual bodies which can then enter into heaven according to :
Matthew 24:30 ( Jesus speaking )
"And they shall see the Son of Man coming in the clouds WITH POWER and great glory."
Mark 13:26 ( Jesus speaking )
"And then they shall see the Son of Man coming in the clouds WITH GREAT POWER and glory."
Luke 21:27 ( Jesus speaking )
"And then shall they see the Son of Man coming in a cloud WITH POWER and great glory."
Revelation 12:10 ( John describes the resurrection & rapture )
"And I heard a loud voice saying in heaven, NOW IS COME SALVATION, and strength, and the Kingdom of our God, and THE POWER OF HIS CHRIST."
SO, THERE YOU HAVE IT:
EVERY ONE of the Scriptures cited above is speaking of the coming of our Lord Jesus with the "POWER OF HIS CHRIST" over the flesh of mankind to resurrect the dead in Christ, and to rapture the living in Christ for ETERNAL LIFE IN HEAVEN.
According to Your Holy Word, Come Lord Jesus !