John Gill Commentary Mark 14:62

"And Jesus said, I am: and ye shall see the Son of man sitting at the right hand of Power, and coming with the clouds of heaven." — Mark 14:62 (ASV)

And Jesus said, I am
That is, the Son of God; in proof of which he adds,

and you shall see the son of man sitting on the right hand of power ;
that is, of God, who is all power, the Lord God Almighty:

and coming in the clouds of heaven ;
either at the destruction of Jerusalem, or at the last day, referring to the prophecy in (Daniel 7:13) ; (See Gill on Matthew 26:64).