If you succeed in cheating someone, don't think that a person is a fool. Realize that the person trusted you more than you deserved..... Who is at lost then? Remember always that at times like this,  it's so hard to find someone who can be trusted with,  specially  when you knew  yourself can't be trusted also... If we are able to cheat any one, expect that it comes  back twice the price... at any circumstance and at any cost...