heaven's net is wide-meshed but lets nothing escape
Proverb from Laozi (老子) meaning that divine justice may seem lenient but ultimately catches all wrongdoers. Used in formal or literary contexts.
Even if you commit evil deeds, heaven's net is wide-meshed but lets nothing escape; you will surely face retribution someday.
From the Chinese classic 老子 (Laozi), chapter 73. The original text is 天網恢恢、疎而不失.