A Question About The Commandments

What is the "greatest" challenge facing America today? Is it global terrorism? Is it an aggressive Russia? National debt? Illegal immigration? Domestic violence? When many issues have some measure of importance, it is difficult to determine which is the "most important". In Mark 12, a brilliant Jewish lawyer challenged Jesus on which of the commandments of Scripture is the "greatest". As Jesus hears this age-old question, how does He respond, and what continuing relevance does His answer have on our Christian lives today?