Or again, some beautiful summer night by the sea-shore you are looking out over the water. The moon is low and her rays make a pathway of light. You gaze along it and at first the waves are clearly visible, heaving in the light; further off, the movement of the waves disappears; only a luminous glow remains, growing fainter and fainter, till far away it melts into that thin line where sky and water meet--the horizon. Do you know that horizon really means boundary, the limit of our sight, the point beyond which our eye has no power to see? But is there nothing beyond? If we took ship and sailed beyond that pathway of light, should we ever reach the horizon? We should only sail on to find the horizon continually beyond our reach.