Reason, Observation and Experience -- the Holy Trinity of Science -- have taught us that happiness is the only good; that the time to be happy is now, and the way to be happy is to make others so. This is enough for us. In this belief we are content to live and die. If by any possibility the existence of a power superior to, and independent of, nature shall be demonstrated, there will then be time enough to kneel. Until then, let us stand erect.
But simple as the Sign of the Cross is, it carries a brave weight: it names the Trinity, celebrates the Creator, and brings home all the power of faith to the brush of fingers on skin and bone and belly. So do we, sometimes well and sometimes ill, labor to bring home our belief in God's love to the stuff of our daily lives, the skin and bone of this world -- and the Sign of the Cross helps us to remember that we have a Companion on the road.