the mills of God grind slowly

The mills of God grind slowly (whatever you do, you can't escape the Day of Judgement or you'll get what you deserve in some way or another) — бог все видит; не скор бог, да меток; на всякого найдется управа; всем воздастся по заслугам рано или поздно

ср. также:

[неисповедимы пути господни]
[бог шельму метит]
[get one's come-uppance]
[get what's coming to one]
[what goes around comes around]
[taste of one's own medicine]
[serves you right]