像海不曾怀疑天的蓝爱她不曾怀疑她的心
[xiàng hăi bù céng huái yí tiān de lán ài tā bù céng huái yí tā de xīn]
An analogy that compares undoubting love to the trust between sea and sky – just as the sea does not doubt the blueness of the sky, one does not question the sincerity and depth of another's heart.