"I pass the test that says a man who isn’t a socialist at 20 has no heart, and a man who is a socialist at 40 has no head"

This quote by William J. Casey recommends that a person's political beliefs and ideologies change as they age. The first part of the quote, "a guy who isn't a socialist at 20 has no heart," suggests that young people tend to be more idealistic and compassionate, and for that reason are more likely to lean towards socialist beliefs. On the other hand, the 2nd part of the quote, "a guy who is a socialist at 40 has no head," recommends that as people age and get more life experience, they end up being more useful and less idealistic, leading them to reject socialist ideas. In general, this quote highlights the evolution of political beliefs and the impact of age and experience on one's ideology.