Fr. John A. Hardon, S.J.. A superficial reading of the Rules for Thinking with ... prohibition against “books and pamphlets which treat of new apparitions, ...
Norms of Catholic Orthodoxy
Fr. John A. Hardon, S.J.. Although human reason may reasonably conjecture ... the form of apparitions, diabolical locutions, hallucinations and the like. ...
The good angels are sent as guardians, but demons tempt men to sin.