Related:

• If at first you don't succeed, try, try, try again.
  Then quit. There's no point in being a damn fool about it. -- W.C. Field...
• If at first you don't succeed, try try again. Then quit. No use being a damn fool about it.
• If at first you don't succeed, try, try agai
• If at first you don't succeed, try, try again. Then quit.
  No use being a damn fool about it. -- W.C. Fields [Also attributed to Roy Mengot. Ed.]...
• If at first you don't succeed, try, try again. -- W.E. Hickso
• If at first you don't succeed, add NT and try again.
• If at first you don't succeed, try again at second base.
• If at first you don't exceed, try, try again.
• If at first you don't succeed, try something else.