Jesus offers a corrective to his disciples (and to us) regarding his true purpose and nature. Whereas his contemporaries were hoping for a Messiah who would dominate their enemies and establish a kingdom of power here on earth, Jesus teaches that he came to lay down his life for the salvation of the world.
Perhaps we, too, have this false understanding of who the Lord is? Many times we pray that God would "come down here" and fix everything. However, that is not why Jesus came to earth, and that is not what he is about right now. Rather, in all things God calls us to faithfulness. Thy will be done!