Man forgets in his selfishness and presumption ... that it is an illusion to suppose that real security can be gained by men organizing their own personal and community life. There are encounters and destinies which man cannot master. He cannot secure endurance for his works. His life is fleeting and its end is death. History goes on and pulls down all the towers of Babel again and again. There is not real, definitive security, and it is precisely this illusion to which men are prone to succumb in their yearning for security.