The “things” the highly-educated St Augustine refers to are the non-theological fields of knowledge he had studied for years, but which seemed of no use to him after his conversion to Christianity. The knowledge of divinity was now sufficient, and Augustine fully endorsed his mentor St. Ambrose's ironclad rule: “the letter kills but the spirit gives life.” This is the sum of religious intensity: a complete and total switch of both mind and action to a single spiritual direction — the ultimate, unrelenting devotion.

Religious intensity takes to extreme a concept that from a practical perspective is useless and often detrimental to basic human needs, even in its moderate and less compromising forms. Worship and prayer demand time that could be invested in production, rest, or recreation. Sacrifices and alms extract funds with no material compensation to the provider. Taboos eliminate dietary, sexual, and behavioral options. Yet, religious people would see it differently.