“you [the high priest] will see the Son of Man sitting at the right hand of the
Mighty One and coming on the clouds of heaven.” Mark 14:62
Jesus was asked by the high priest if he was the messiah, he didn’t answer ‘yes’ but rather confirmed that he was by telling the high priest what it will be like at the moment when he will know for certain that it is so.
Why did he do that? Maybe because, right there in front of the priest, Jesus looked very un-messiah like, he looked very ordinary.
But the language he uses to tell the priest that he is the messiah is language the priest would instantly have recognised - Daniel 7:13-14.
To him was given dominion, and glory, and kingdom, that all peoples and nations and languages should serve him.
Jesus was declaring that his imminent death would inaugurate his kingdom reign (Hebrews 12:2). His death means that in every redeemed soul an eternal throne has been set up and nothing can unseat the King of Kings and Lord of Lord’s from that throne (Revelation 1:6).
It speaks of a day that is coming in the future, when Jesus will visibly return and be seen by everyone, and every knee shall bow and every tongue confess him King of Glory - even the high priest himself, who’s heart, gripped with unbelief in that moment, could not behold the messiah right there in front of him.