““Social Security gives concrete expression to widely held and time-honored American commitments. Grounded in values of shared responsibility and concern for all members of society, it reflects an understanding that, as citizens and human beings, we all share certain risks and vulnerabilities; and we all have a stake in advancing practical mechanisms of self- and mutual support. It is based on the belief that government—which is simply all of us acting collectively—can and should uphold these values by providing practical, dignified, secure, and efficient means to protect Americans and their families against risks they all face.””