from Pope Benedict’s homily at the Holy Thursday Evening Mass of the Lord’s Supper: 

“…we must also pay attention to the content of Jesus’ prayer on the Mount of Olives. Jesus says: “Father, for you all things are possible; remove this cup from me; yet not what I want, but what you want” (Mk 14:36). The natural will of the man Jesus recoils in fear before the enormity of the matter. He asks to be spared. Yet as the Son, he places this human will into the Father’s will: not I, but you. In this way he transformed the stance of Adam, the primordial human sin, and thus heals humanity. The stance of Adam was: not what you, O God, have desired; rather, I myself want to be a god. This pride is the real essence of sin. We think we are free and truly ourselves only if we follow our own will. God appears as the opposite of our freedom. We need to be free of him – so we think – and only then will we be free. This is the fundamental rebellion present throughout history and the fundamental lie which perverts life. When human beings set themselves against God, they set themselves against the truth of their own being and consequently do not become free, but alienated from themselves. We are free only if we stand in the truth of our being, if we are united to God. Then we become truly “like God” – not by resisting God, eliminating him, or denying him. In his anguished prayer on the Mount of Olives, Jesus resolved the false opposition between obedience and freedom, and opened the path to freedom. Let us ask the Lord to draw us into this “yes” to God’s will, and in this way to make us truly free. Amen.”

Full text of Pope Benedict’s Holy Thursday homily at this link.