The Baal Shem Tov taught that every word you overhear, no matter how seemingly inconsequential, is in fact spoken for your ears alone. Every moment, life presents you with another opportunity to look within yourself and see where you can improve the quality of your thought, word, and deed. Do not imagine that the world revolves around you — it doesn't. But know that whatever is in the world is in you as well. Let reality be your rebbe.

Rami Shapiro, Hasidic Tales