Chapter 26 — Part III: The Decalogue — The Third Commandment
Section 10. As nature requires some time to be given to necessary functions of the body, to sleep, repose and the like, so she also requires that some time be devoted to the mind, to refresh itself by the contemplation of God. Hence, since some time should be devoted to the worship of the Deity and to the practice of religion, this (Commandment) doubtless forms part of the moral law.