SimchaMinute by Rabbi Avigdor Miller
Sometimes you will see a man come to shul, a baal teshuvah full of idealism, he comes early every morning, doesn’t talk during davening, he’s respectful in the synagogue. After a while he begins to feel at home and he starts coming later. Sometimes he misses entirely, and sometimes he talks and behaves with gaiety, because his idealism wore off.
Even when we start off with idealism, the materialism of our surroundings eventually envelopes us and overcomes us. So you must live with a certain amount of introspection, and continue to maintain and to add to your idealism.
— Mesilas Yesharim 2