In Robert Frost`s A Masque of Mercy we find strong continuity of his A Masque of Reason in its forms and themes. While A Masque of Reason focuses on God`s justice, the dominant discourse of the Old Testament, A Masque of Mercy centers on God`s mercy, the prevalent discourse of the New Testament. The two masques pursue to resolve or clarify the oppositions or conflicts between the good and the evil, God`s justice and His mercy, through the dialectical dialogues among the characters, but end in uncertainty without leading to a certain synthesis. This uncertainty is more than enough to draw the unfavorable responses from the critics who have sought to find a final resolution in the masques. The uncertain conclusions of both plays are the natural outcome of Frost`s belief in the limitations of man`s reason and language as a means to explain life`s moral as well as religious mystery. Frost maintains that metaphor is a particular system of language through which we perceive what we know as reality, but it is subject to an easy breakdown and needs to be continuously renewed. This belief goes with the post-modern doubt of the ability of language to represent reality. Frost`s theory of metaphor leads to his assertion that the whole of human thinking is limited to metaphoric constructions and there can be no certain answers in the world. Christianity, which is based on proto-language, does not permit the pluraity of language. For the critics and readers who are oriented to the Christian monistic thought, it is very natural that Frost`s two masques seem to be frivolous, loose, or inconclusive in their conclusions. Just as A Masque of Reason betrays the expectation that, in the dialectics of the good and the evil, the good should prevail over the evil and establish once and for all the justice of God, so A Masque of Mercy does not meet the undeserving human wish that man`s salvation be guaranteed by God`s mercy alone. Thus we live in eternal uncertainty of God`s judgment of our deeds or sacrifices. In A Masque of Mercy, however, Frost does not remain in uncertainty, but stresses through the mouths of Keeper and Jesse Bel the necessity of faith. Faith leads to courage to overcome the deep "fear of within the soul / And go ahead to any accomplishment". Frost knows better than to believe that "any accomplishment" is enough to secure man`s final salvation, and therefore he suggests that we have no other way than to depend on God`s mercy for our final salvation, but we cannot sit passively waiting for God`s mercy. After accomplishing something to our best through faith and courage, that is, after "doing Justice justice" , we deserve to plead for God`s mercy. This is the best way for man to live in the world of uncertainty.