Non omnium, quae a majoribus nostris constituta sunt, ratio reddi potest; et ideo rationes eorum quae constituuntur inquiri non oportet; alioquin multa ex his quae certa sunt subvertuntur

It is impossible to give reasons for all of the laws instituted by our ancestors and so it is not needful to inquire into the reasons; otherwise many of those which are established would be overturned. See 1 Bl Comm 70.