Merry meet, merry part.
好聚好散。

Meet plot with plot.
将计就计。

Man proposes, God disposes.
谋事在人，成事在天。

Life is a span.
人生如朝露。

Keep something for a rainy day.
未雨绸缪。

Just has long arms.
天网恢恢，疏而不漏。

It six of one and half a dozen of the other.
彼此彼此。

It is never too late to mend.
亡羊补牢，犹未为晚。

If you are not inside a house, you don not know about its leaking.
不在屋里，不知漏雨。

Home is where the heart is.
心在哪里，哪里就是家。