Anyone who has never made a mistake has never tried anything new.

Related:

• The release of atomic energy has not created a new problem.
  It has merely made more urgent the necessity of solving...
• Never do anything against conscience even if the state demands it.
  Albert...
• Anyone who uses the phrase "easy as taking candy from a baby" has never tried taking candy from a baby.
  Robin...
• He who never made a mistake never made a discovery.
  Samuel...
• He who joyfully marches to music in rank and file has already earned my contempt.
  He has been given a large brain by mistake, since for...
• A bachelor is a man who never made the same
  mistake once...