There is an old Jewish legend in which a rich but miserable man goes to see his rabbi.  The wise old rabbi leads him to a window.   “Look out there’, he says, ‘and tell me what you see.’

‘I see people’, answers the rich but miserable man.  Then the rabbi leads him to a mirror.

‘What do you see now?’ he asks.  “I see myself,” says the rich but miserable man.

Then the rabbi says: “Behold! In the window there is only glass and in the mirror there is glass.  But the glass of the mirror is covered with a little silver, and no sooner is a little silver added than you cease to see others and see only yourself.”