''Are you ready for the weekend?'' one young woman asked the other, as the elevator zipped upward passing unbuzzed floors. ''Oh yes,'' replied the other, 'Our local theater is showing old films and we're going two nights!'' Light escapades fill our weekends like butterfly thoughts on a summer's day. But what about the moment? Will it slip by unnoticed like ticks on a grandfather clock? Cherish the moment, shield its timeless motion. Let this moment be your zenith for living!