In believing the specified Jewish day to be still of obligation. You do not seem to understand that the Old Law was but figurative of the more perfect New Law, and that in the New Law Christ established the Catholic Church which clearly teaches the change of ceremonial day. If you want to keep the ceremonial day of the Jews, you may as well keep the lot, and abolish Baptism in favor of Circumcision.
Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty