When you get up in the morning, you have to wash your hands immediately because during the night the external forces — external loves and fears — come to rest on you. . . . So you have to wash your hands immediately to remove these external loves and fears from you; you also have to immediately go to the bathroom and clean out your body for the same reason. [Waste within the body influences the mind to lower loves and fears.] (The Seder ha-Yom of Rabbi Shalom Shachna of Probitch, in D'vir Yaakov)
— Rabbi Shalom Shachna of Probitch in Jewish Spiritual Practices by Yitzhak Buxbaum