en_tn_condensed/mrk/14/38.md

that you do not enter into temptation

"that you are not tempted"

The spirit indeed is willing, but the flesh is weak

"You are willing in your spirit, but you are too weak to do what you want to do" or "You want to do what I say, but you are weak"

The spirit ... the flesh

These refer to two different aspects of Peter. "The spirit" is his inmost desires. "The flesh" is his human ability and strength.