expression
heaven's net is wide and coarse, yet nothing slips through
A yojijukugo proverb meaning that divine justice may seem slow and lenient, but ultimately no wrongdoing escapes punishment. Often used to warn that evil deeds will eventually be caught.
天網恢恢疎にして漏らさず、悪事は必ず露見する。
Heaven's net is wide and coarse, yet nothing slips through; wrongdoing will inevitably be exposed.
From the Chinese classic 'Laozi' (Tao Te Ching), chapter 73: '天網恢恢、疎而不失' (Heaven's net is wide and coarse, yet nothing slips through). The Japanese yojijukugo preserves the original meaning.