天不曾怀疑海的清海不曾怀疑天的蓝
[tiān bù céng huái yí hăi de qīng hăi bù céng huái yí tiān de lán]
'The sky has never doubted the sea’s clarity; the sea has never doubted the sky's blue,' suggesting trust, serenity, or purity between elements which metaphorically represent people or ideals.