It can be confusing when discussing the various terms related to Catholic Teaching. Doctrine is Church Teaching in matters of faith and morals that Catholics must believe and follow (Catholics have no choice). Some doctrine is taught by the Church but not considered infallible, some doctrine is infallibly taught by the Church, and finally some doctrine is taught infallibly and also considered divinely revealed by God–AKA Dogma. Church discipline is also considered teaching, but, unlike Doctrine, it can be changed with approval of appropriate Church authority.