en_tn/mrk/14/62.md

I am

This likely has a double meaning: 1) to respond to the high priest's question and 2) to call himself "I Am," which is what God called himself in the Old Testament.

he sits at the right hand of power

Here "power" is a metonym that represents God. To sit at the "right hand of God" is a symbolic action of receiving great honor and authority from God. Alternate translation: "he sits in the place of honor beside the all-powerful God" (See: rc://en/ta/man/translate/figs-metonymy and rc://en/ta/man/translate/translate-symaction)

comes with the clouds of heaven

Here the clouds are described as accompanying Jesus when he returns. Alternate translation: "when he comes down through the clouds in the sky" (See: rc://en/ta/man/translate/figs-metaphor)