De civilitate morum puerilium libellus

It is even more indecent that some walk about in temples and act like Peripatetics the followers of Aristotle known for walking while teaching. But porticos and marketplaces are suitable for walking, not temples, which are dedicated to sacred sermons, mysteries, and prayers.

Walking in church indecorously.

Sermons.

Let your eyes look toward the preacher, let your ears be attentive there, let your mind hang upon it with all reverence, as if you were not hearing a man, but God speaking to you through the mouth of a man. When the Gospel is recited, rise, and if you can, listen religiously. When it is sung in the creed: "And he was made man," fall upon your knees, or in this way submitting yourself to his honor...