A little mole once said to his mother:"Why, mother, you said I was blind! but I am sure I can see!"Mother mole saw she would have to get such conceit out of his head. So she put a bit of frankincense before him and asked him to tell what it was. The little mole peered at it. "Why, that's a pebble!""Well, my son, that proves you've lost your sense of smell as well as being blind." 
Boast of one thing and you will be found lacking in that and a few other things as well. 