Of a hundred, and perhaps a thousand, of these articulated locutions, there is hardly one genuine. It is difficult, even for spiritual masters, to discern the true from the false, those of the Spirit of truth from those of the devil, who knows so well how to feign effects like in appearance to those of the Spirit of God. Therefore it is best to enjoin on him who has them to drive them away, to humble himself before God, and to protest that faith, with the Scriptures and the advice of his spiritual father, who speaks in God's name, are sufficient for him. Thus he glorifies God in distrusting himself, in humbling himself, in esteeming himself unworthy of such favors, and is thereby freed from illusion.
--St. Paul of the Cross
