I would say Man vs. himself. Digory is definitely attempting to find himself and his place in the world or in Lewis' created worlds. This adventure is a series of events which allow Digory to rise and fall within the every day human life of decision-making. He makes poor choices and is allowed to be redeemed and forgiven. Digory brings evil into Aslan's beautiful new world, but he is given a chance to redeem himself. He proves that he is worthy as he brings peace and freedom from evil to Narnia. This is Lewis' way of representing God's mercy and generosity, because in each case Aslan (the Christ figure in this book as well as The Lion, the Witch and the Wardrobe) provides a way for people who have taken the path to evil to be forgiven and to be redeemed. In this way, they are granted the guarantee of life beyond death.