Read Ecclesiastes 9:12 Using Other Translations
For man also knoweth not his time: as the fishes that are taken in an evil net, and as the birds that are caught in the snare; so are the sons of men snared in an evil time, when it falleth suddenly upon them.
For man does not know his time. Like fish that are taken in an evil net, and like birds that are caught in a snare, so the children of man are snared at an evil time, when it suddenly falls upon them.
People can never predict when hard times might come. Like fish in a net or birds in a trap, people are caught by sudden tragedy.