Sentence:  In a long commentary which he has inserted in the published text of the first act of the play , he says at one point : `` However , that experience never raised a doubt in his mind as to the reality of the underworld or the existence of <WSD>Lucifer</WSD> 's many faced lieutenants . 
Meaning of the word marked with <WSD> tags:  (Judeo-Christian and Islamic religions) chief spirit of evil and adversary of God; tempter of mankind; master of Hell