This puzzled the farmer. But he liked the young man, and hired him.
A few days later, the farmer and his wife were awakened in the night by a violent storm. They quickly began to check things out to see if all was secure. They found that the shutters of the farmhouse had been securely fastened. A good supply of logs had been set next to the fireplace.
The young man slept soundly.
The farmer and his wife then inspected their property. They found that the farm tools had been placed in the storage shed, safe from the elements.
The tractor had been moved into the garage. The barn was properly locked. Even the animals were calm. All was well.
The farmer then understood the meaning of the young man's words, "I can sleep when the wind blows."
Because the farmhand did his work loyally and faithfully when the skies were clear, he was prepared for the storm when it broke. So when the wind blew, he was not afraid. He could sleep in peace.