But the reference to the great Mystics’ chief and direct test, upon which they dwell with an assurance and self-consistency far surpassing that which accompanies their psychological argument,--the spiritual content and effects of such experiences,--this, retains all its cogency. St. Teresa tells us: “When Our Lord speaks, it is both word and work: His words are deeds.” “I found myself, through these words alone, tranquil and strong, courageous and confident, at rest and enlightened: I felt I could maintain against all the world that my prayer was the work of God.” “I could not believe that Satan, if he wished to deceive me, could have recourse to means so adverse to his purpose as this, of rooting out my faults, and implanting virtues and spiritual strength: for I saw clearly that I had become another person, by means of these visions.” “So efficacious was the vision, and such was the nature of the words spoken to me, that I could not possibly doubt that they came from Him.” “I was in a trance; and the effects of it were such, that I could have no doubt it came from God.” On another occasion she writes less positively even of the great test: “She never undertook anything merely because it came to her in prayer. For all that her Confessors told her that these things came from God, she never so thoroughly believed them that she could swear to it herself, though it did seem to her that they were spiritually safe, because of the effects thereof.”[48] This doctrine is still the last word of wisdom in these matters. 2. _First special difficulty in testing ecstasies._