The time-space-causality reference is an essential part of human nature, a governing law of human thinking. These three hold good solely within such thinking and can have no possible or proper application outside it. Man does not consciously or arbitrarily impose them upon his thought; it is beyond his individual power to reject them.
-- Notebooks Category 19: The Reign of Relativity > Chapter 4: Time, Space, Causality > # 2
-- Perspectives > Chapter 19: The Reign of Relativity > # 5