"Golden bird" is a symbol for the sun; "Jade rabbit" represents the moon. The entire phrase means "Time passesquickly," or from the Buddhist perspective, "All things are impermanent." This was brushed on New Year's day by Goun. He is telling us that another year has passed, days and months are flying by, so we should not waste time on petty concerns. The Zen rabbit is not shown scurring about but is rather depicted sitting quietly, in a state of repose, enjoying the moment.
