 The church gathers a team of scientists, theologians, and other experts to test the spirit of the alleged visionary to see if he is genuine, psychotic or manipulative, influenced by drugs, deceptive or deceived, or possessed by demons.Revelations from God are an extraordinary grace which confirms Catholic doctrine and dogma.One famous example is Our Lady of Lourdes, who declared Mary to be the Immaculate Conception four years after the dogma of the Immaculate Conception was proclaimed.