6.  I have felt compelled to write to you in these terms, that you may be on your guard against the mischief arising from bad teaching.  If we may indeed liken pernicious teachings to poisonous drugs, as your dream-tellers have it, these doctrines are hemlock and monkshood, or any other deadly to man.  It is these that destroy souls; not my words, as this shrieking drunken scum, full of the fancies of their condition, make out.  If they had any sense they ought to know that in souls, pure and cleansed from all defilement, the prophetic gift shines clear.  In a foul mirror you cannot see what the reflexion is, neither can a soul preoccupied with cares of this life, and darkened with the passions of the lust of the flesh, receive the rays of the Holy Ghost.  Every dream is not a prophecy, as says Zechariah, “The Lord shall make bright clouds, and give them showers of rain,…for the idols have spoken vanity and the diviners have told false dreams.” Zech. x. 1, 2.  Those who, as Isaiah says, dream and love to sleep in their bed cf. Is. lvi. 10. forget that an operation of error is sent to “the children of disobedience.” Eph. ii. 2.  And there is a lying spirit, which arose in false prophecies, and deceived Ahab. 1 Kings xxii. 22.  Knowing this they ought not to have been so lifted up as to ascribe the gift of prophecy to themselves.  They are shewn to fall far short even of the case of the seer Balaam; for Balaam when invited by the king of Moab with mighty bribes brooked not to utter a word beyond the will of God, nor to curse Israel whom the Lord cursed not. Num. xxii. 11.  If then their sleep-fancies do not tally with the commandments of the Lord, let them be content with the Gospels.  The Gospels need no dreams to add to their credit.  The Lord has sent His peace to us, and left us a new commandment, to love one another, but dreams bring strife and division and destruction of love.  Let them therefore not give occasion to the devil to attack their souls in sleep; nor make their imaginations of more authority than the instruction of salvation.