in all its parts, and dies before it can be dissected." Finally Tolkien states directly "We do not deny the worth of the hero by accepting Grendel and the dragon." Man in a hostile world In Tolkien's view, the poem is essentially about a "man at war with the hostile world, and his inevitable overthrow in Time". The underlying tragedy is man's brief mortal life. Grendel and the dragon are identified as enemies of a Christian God, unlike the monsters encountered by Odysseus on his travels. What had happened is that Northern courage, exultant, defiant in the face of inevitable defeat by "Chaos and Unreason" (Tolkien cites Ker's words), fuses with a Christian faith and outlook. The Beowulf poet uses both what he knew to be the old heroic tradition, darkened by distance in time, along with the newly acquired Christian tradition. The Christian, Tolkien notes, is "hemmed in a hostile world", and the monsters are evil spirits: but as the transition was incomplete in the poem, the monsters remain real and the focus remains "an ancient theme: that man, each man and all men, and all their works shall die". Tolkien returns to the monsters, and regrets we know so little about pre-Christian English mythology; he resorts instead to Icelandic myth, which he argues must have had a similar attitude to monsters, men and gods. The Northern gods, like men, are doomed to die. The Southern (Roman and Greek) pagan gods were immortal, so to Tolkien (a Christian), the Southern religion "must go forward to philosophy or relapse into anarchy": death and the monsters are peripheral. But the Northern myths, and Beowulf, put the monsters, mortality and death in the centre. Tolkien is therefore very interested in the contact of Northern and Christian thought in the poem, where the scriptural Cain is linked to (giants) and (elves), not through confusion but "an indication of the precise point at which an imagination, pondering old and new, was kindled". The poem is, Tolkien states, "an historical poem about the pagan past, or an attempt at one", obviously not with modern ideas of "literal historical fidelity". The poet takes an old plot (a marauding monster troubling the Scylding court) and paints a vivid picture of the old days, for instance using the Old Testament image of the shepherd patriarchs of Israel in the (people's shepherd) of the Danes. Structure: youth versus age