Calvin and Hobbes by Bill Watterson for April 16, 1991
Calvin: Let's say life is this square of the side-walk. We're born at this crack and we die at that crack. Now we find ourselves somewhere inside the square, and in the process of walking out of it. Suddenly we realize our time in here is fleeting. Is our quick experience here pointless? Does anything we say or do in here really matter? Have we done anything important? Have we been happy? Have we made the most of these precious few footsteps??