The Baal Shem Tov teaches that everything in this world is b'hashgachah protis. Everything a person sees or hears, everything that happens, is not by chance; it is all planned by Hashem. And if Hashem sees fit to make a thing happen, the Baal Shem Tov explained, then we should try our best to learn something from it. If we see or hear something, we should know that there is a lesson in it, teaching us how to serve Hashem.
 Kesser Shem Tov, Addendum, sec. 127ff.