By luck.

Bad things will have good results and good things will have bad results.

From the fifty-eighth chapter of Laozi: "Misfortune is a place to lean on, and happiness is where the misfortune lies." Unfortunately is a Chinese word, which basically means that bad things can lead to good results, and good things can also lead to bad results.

An old frontiersman loses his horse—a blessing in disguise. Accidents will happen. Fortune changes at any time, and life takes turns. Dawn comes before night and spring comes after winter.