Related:

• It has been said [by Anatole France], "it is not by amusing oneself that one learns," and, in reply
  it is *____only* by amusing oneself that one can learn....
• It's not by amusing oneself that one learns. -- Anatole France (1844-1924) It's only by amusing oneself that one can learn.
  -- Edward Kasner and James R. Newma...
• There is a certain impertinence in allowing oneself to be burned for an opinion.
  -- Anatole France...
• Wild animals never kill for sport. Man is the only one to whom the torture and death of his fellow creatures is amusing in itself.
  -- James A. Froude (1818-1894)...
• Society's external rewards are no measure of true success.
  True success can be measured only in relation to the goals one sets for oneself....