The negative man picked up a glass half filled with water.....seeing the Master he said "is this glass half full?".....the Master shook his head.....the man smiled "I thought you were SO POSITIVE, so is it half empty?"....the Master shook his head again...the man, suddenly becoming aggravated quipped "if it's not half full and it's not half empty what is it?!?!" ....the Master looked him squarely in the eye and quietly said "the glass is always completely full, of both air and water".