One lie does not cost you one truth, but the truth.

Related:

• He who cannot lie doesn't know what truth is. --
  Friedrich...
• Lie: A very poor substitute for the truth,
  but the only one discovered to date...
• Lie, n.: A very poor substitute for the truth,
  but the only one discovered to date...
• LIE: A very poor substitute for the truth,
  but the only one discovered to date...
• If one cannot invent a really convincing lie, it is often better to stick to the truth.
  Angela...
• A lie that can be passed off as truth becomes
  truth...
• One day the King decided that he would force all his subjects to tell the truth.
  A gallows was erected in front of the city gates. ...