比鬼神更可怕地是人心
[bĭ guĭ shén gèng kĕ pà dì shì rén xīn]
'Human Hearts are More Terrifying Than Ghosts and Gods'. This saying reveals deep concern over human morality: people's hearts can be worse than spirits in the afterlife because they have no set rules guiding behavior leading to various unpredictable actions.