Theory about cup and water

erm...there was one teacher who took a few cups for his/her students...all the nice cups were chosen, left the least attractive one there. then the theory said, no matter how nice the cup is, wat we drink is the water. the cup symbolizing alot of thing such as money, works, business, problems, materialism blablabla. but the main thing is stil the life, the true life we should persue