It is the unforeseen that always happens

• 天有不测风云；人有旦夕祸福

It is the unforeseen that always happens的用法和样例：

例句

1. Nothing is so certain as the unexpected.
   天有不测风云，人有旦夕祸福。
2. Nothing is so certain as the unexpected.
   天有不测风云，人有旦夕祸福。