Out of the Silent Planet was written by C. S. Lewis as a Christian allegory. Ransom, like Lewis himself, was a philologist who taught at Cambridge University. He functions as an "everyman" character, morally located between the pure evil of Weston and Devine and the pure good of the eldila. Ransom, like the Christian, is a fallen character who belongs to Thulcandra, but who can nonetheless percieve and understand Oyarsa.
In his profession as a philologist, Ransom is a translator. That enables him to make the words and ideas of Thulcandra comprehensible to those of Malacandra and vice versa. His nature is neither purely fallen nor unfallen, but like post-Adamic humanity, "simul iustus et peccator" (both righteous and sinner), both part of a world fallen into original sin and yet made in the image of God and redeemed by Jesus.