The Baal Shem Tov taught that everything encountered by a Jew should provide a lesson in his service to H'shem. Even something seen or heard previously must provide a fresh lesson, for since by Divine Providence a person has encountered it again, it is not a coincidence, but must provide a loftier lesson. G‑d did not create anything in His world for naught, and since H'shem has shown him something yet another time, it is for a purpose — to learn a new lesson in service to H'shem. And if a person does not utilize this opportunity, he is wreaking havoc on the concept of creation. chabad.org There is a great principle, "Walk modestly with H'shem" (Micha), that all of a man's ways must be modest. When a person does things in a public manner, it is easier to feel proud and have ulterior motives when serving H'shem; however, when he does things modestly in private, he will not have ulterior motives since no one sees him. MiPeninei Noam Elimelch