A proverb meaning that good and bad fortune are unpredictable and can change; you cannot be sure whether an event is ultimately fortunate or unfortunate.
病気で仕事を失ったが、新しい仕事で成功した。人間万事塞翁が馬だ。
He lost his job due to illness but succeeded in a new job. Truly, fortune is unpredictable.
このことわざ、人間万事塞翁が馬は、何が幸運につながるか分からないという教えだ。
The proverb 'Ningen banji saiō ga uma' teaches that you never know what will lead to good fortune.