Related:

• Everything changes but change itself. -- John F. Kennedy
• The United States was not built by those who waited and rested and wished to look behind them.
  This country was conquered by those who moved forward, and so will space....
• Those who make peaceful revolution impossible will make violent revolution inevitable.
  -- John F. Kennedy...
• Those who make peaceful revolution impossible will make violent revolution inevitable.
  -- John F. Kennedy...
• Only those who dare to fail greatly can ever achieve greatly. Robert F. Kennedy
• Those who are bored with your tale of persecution are only too happy to listen to your plans for revenge.
  -- John Francis Putnam (1964)...
• There's no present. There's only the immediate future and the recent past. -- George Carli