平生不做虧心事，半夜敲門心不驚 [－－－－亏－－－－－－门－－惊]

Jyutping ping4 sang1 bat1 zou6 kwai1 sam1 si6 , bun3 je6 haau1 mun4 sam1 bat1 geng1
Pinyin píng shēng bù zuò kuī xīn shì , bàn yè qiāo mén xīn bù jīng

Definitions (CC-CEDICT)
  1. He who never wrongs others does not fear the knock in the night.
  2. Rest with a clear conscience.