<P> Such sessions include supervised use of ganja intended to put participants in touch with peaceful feelings, unity, and "consciousness ." Rasta philosophy describes ganja - conscious humans "as the temple of God, within which God dwells ." Using ganja is said to "stimulate this inner being through spiritual discourse ." </P> <P> In these sessions, ganja is smoked in joints or in a chalice (Waterpipe or bong), although Rasta witnesses said chalice smokers had to be very "mature and clean - spirited" due to the powerful hits delivered by this unique and potent form of inhalation device . </P> <P> The term "poisoned chalice" is applied to a thing or situation which appears to be good when it is received or experienced by someone, but then becomes or is found to be bad . The idea was referred to by Benedict of Nursia in one of his exorcisms, found on the Saint Benedict Medal: Vade retro Satana! Nunquam suade mihi vana! Sunt mala quae libas . Ipse venena bibas! (Begone Satan! Never tempt me with your vanities! What you offer me is evil . Drink the poison yourself!). William Shakespeare uses the expression in Act I Scene VII of Macbeth . It occurs in the opening soliloquy of the scene when Macbeth is considering the ramifications of the murder he is plotting . </P> <P> But in these cases We still have judgment here; that we but teach Bloody instructions, which, being taught, return To plague the inventor: this even - handed justice Commends the ingredients of our poison'd chalice To our own lips . </P>

Where does the phrase poison chalice come from