...the ceremonial precepts of the Old Testament were certain determinations of the precepts of natural rights and moral precepts. And therefore, with regard to this, those things which they used to hold from natural right were kept before the Law only for the observance of a vow, and without some precept. For, that something be offered to God in recognition of creation and dominion, this is natural; but that bulls and goats be offered, this is ceremonial.
[Thomas Aquinas, Commentary on the Epistle to the Hebrews, Baer, tr. St. Augustine's Press (South Bend, IN: 2006) p. 142.]