The moon may be dim or bright, wax and wane.

Even the moon is sometimes full and sometimes partial; nothing can be perfect all the time. 「月有陰晴圓缺, 人有旦夕禍福」，做事總不可能盡善盡美，總會有無法掌握的事情.，一切循環如月的陰晴圓缺 Daha Fazla Bilgi