There was a peacock who often boasted about his beauty. Everyday he walked to the banks of a large lake and looked his own reflections and said "Oh! what a beautiful bird I am! look at my colourful tail". Once the peacock saw a crane on the banks of the lake. He said with a sneer to the crane, "What a colourless bird you are! you have no beautiful and colourful feathers like mine". The crane replied, "Of course! I don't have beautiful feathers. but, my feathers can make me fly across the lake. can your feathers make you fly?" There was no reply from the peacock. 
It is better to be useful than to be beautiful. 