Related:

• Live in the past and future only.
• Change is the law of life. And those who look only to the past or present are certain to miss the future.
  -- John F. Kennedy, 1964...
• It's Kinda Like A Symbiosis, But More Expensive...
• Today's robots are very primitive, capable of understanding only a few simple instructions such as 'go left', 'go right', and 'build car'.
  -- John Sladek...
• The future is much more difficult to predict than the past.
• Life is like...life. ...But not exactly.
  -- The Uncertainty Principle, according to the Mountaintop Guru...
• Some parts of the past must be preserved, and some of the future prevented at all costs.
• What does self-denial mean to you, Roderick? Gee father, I don't know, is it like the cretin that says all cretins are liars?
  -- "Roderick", John Sladek...