The Church, according to the testimony of her most approved writers, recognises three descriptions of ecstasy; of which the first is simply natural, and entirely brought about by certain physical tendencies and a highly imaginative mind; the second divine or angelic, arising from intercourse held with the supernatural world; and the third produced by infernal agency. (See, on this head, the work of Cardinal Bona, De Discretione Spirituum.) Lest we should here write a book instead of a preface, we will not enter into any development of this doctrine, which appears to us highly philosophical, and without which no satisfactory explanation can be given on the subject of the soul of man and its various states. The Church directs certain means to be employed to ascertain by what spirit these ecstasies are produced, according to the maxim of St. John: 'Try the spirits, if they be of God.' (1 Jn 4:1). When circumstances or events claiming to be supernatural have been properly examined according to certain rules, the Church has in all ages made a selection from them. Many persons who have been habitually in a state of ecstasy have been canonised, and their books approved. But this approbation has seldom amounted to more than a declaration that these books contained nothing contrary to faith, and that they were likely to promote a spirit of piety among the faithful. For the Church is only founded on the word of Christ and on the revelations made to the Apostles. Whatever may since have been revealed to certain saints possesses purely a relative value, the reality of which may even be disputed--it being one of the admirable characteristics of the Church, that, though inflexibly one in dogma, she allows entire liberty to the human mind in all besides. Thus, we may believe private revelations, above all, when those persons to whom they were made have been raised by the Church to the rank of Saints publicly honoured, invoked, and venerated; but, even in these cases, we may, without ceasing to be perfectly orthodox, dispute their authenticity and divine origin. It is the place of reason to dispute and to select as it sees best.