207 To those whom an excessive zeal occasionally led to say and do certain things which saddened Us and which We could not approve, we repeat the warning of St. Paul, "But prove all things, hold fast that which is good." Let Us paternally warn them to imitate in their thoughts and actions the Christian doctrine which is in harmony with the precepts of the immaculate Spouse of Jesus Christ, the mother of saints.
Source: Mediator Dei (Vatican.va)