The way to be safe is never to feel secure.
More Czech Proverbs:
The fish does not go after the hook, but after the bait.Czech
The big thieves hang the little ones.
Czech
Many a friend has been lost by a jest, but none has ever been got by one.
Czech
A crow sits next to a crow.
Czech
Better to have a handful of might than a sack of justice.
Czech
When you go to buy, use your eyes, not your ears.
Czech