夏始夏末夏不离冬暖冬凉冬不分
[xià shĭ xià mò xià bù lí dōng nuăn dōng liáng dōng bù fēn]
Summers Begin, End And Never Depart; Winters Are Warm Or Chilly But Unchanging In Our Hearts: Conveys constancy through changing seasons and conditions, possibly about an undying passion or friendship enduring against adversity.