“A man writing a letter is a man in the act of thinking, and it was an exercise Reagan obviously enjoyed. After his first meeting with Gorbachev, for example, he sent a 'Dear Murph' letter about it to his old friend George Murphy, a former senator and actor who had once played Reagan's father in a fi”

“Our empirical criterion for a series of theories is that it should produce new facts. The idea of growth and the concept of empirical character are soldered into one.”