A MOLE1, a creature blind from birth, once said to his Mother: "I

　　am sure than I can see, Mother!" In the desire to prove to him

　　his mistake, his Mother placed before him a few grains of

　　frankincense, and asked, "What is it?' The young Mole said, "It

　　is a pebble2." His Mother exclaimed: "My son, I am afraid that you

　　are not only blind, but that you have lost your sense of smell.