Some men have a foolish habit of telling their business secrets. If they
make money they like to tell their neighbors how it was done. Nothing is
gained by this, and ofttimes much is lost. Say nothing about your profits,
your hopes, your expectations, your intentions. And this should apply to
letters as well as to conversation. Goethe makes Mephistophiles say: "Never
write a letter nor destroy one." Business men must write letters, but they
should be careful what they put in them. If you are losing money, be specially
cautious and not tell of it, or you will lose your reputation.