"...mandatory..."
God alone is Lord of the conscience, and has left it free from the doctrines and commandments of men, which are, in any thing, contrary to His Word; or beside it, if matters of faith, or worship. So that, to believe such doctrines, or to obey such commands, out of conscience, is to betray true liberty of conscience: and the requiring of an implicit faith, and an absolute and blind obedience, is to destroy liberty of conscience, and reason also. (WCF, Chap. XX.II)