The quote, "the spirit is willing, but the flesh is weak" is from the Bible. Mark 14:38 "Keep watching and praying that you may not come into temptation;the spirit is willing, but the flesh is weak."
No. Lol. You have the wrong spirit. There are two definitions of spirit that i know. First one: The presence of a soul (ghost). Second one: To be cheerful. Spirit week is to be cheerful.