If you're already in a hole, there's no use to continue digging.

Related:

• The only job where you start at the top is digging
  a hole...
• When in a hole, stop digging. --
  Dennis Healy (Former British...
• You use unfamiliar words -- please re-phrase it,
  or try something else...
• If you need a wand of digging,
  kindly ask the minotaur...
• If at first you don't succeed, try, try again. Then quit.
  No use being a damn fool about it. -- W.C. Fields...
• It's not the bullet that kills you,
  it's the hole...
• Money is like a sixth sense -- and you can't make use of the other five without it.
  W. Somerset Maugham (1874...
• Skinner: Willy, some time over the holiday weekend the beloved grade four gerbil,
  uh, Superdude, lost his life. I need you to air ...
• To use violence is to already be defeated. --
  Chinese...