The Work
The Screwtape Letters was published in 1942 by Geoffrey Bles and is generally considered Lewis's most perfectly executed book. It consists of thirty-one letters from the senior demon Screwtape to his nephew Wormwood, who has been assigned his first human patient - a young British man who converts to Christianity early in the book and whose subsequent spiritual life Wormwood is tasked with corrupting. The final letter, combined with the preface's note that Wormwood has been eaten by Screwtape for his failure, gives the epistolary satire a grim comic closure.
Lewis wrote the letters at speed, publishing them first in the Anglican weekly The Guardian between May and November 1941. He later said the book was 'the most difficult of his books to write' - not technically but spiritually: thinking from Screwtape's perspective required inhabiting a consciousness of pure malice and self-interest, and he found this 'enervating' and 'dust and ashes.' The book sold over a million copies in its first decade and was translated into more than thirty languages.
Biblical Engagement
Ephesians 6:12 ('For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places') is the book's primary biblical warrant. Lewis takes Paul's cosmology of spiritual warfare with full seriousness, presenting a bureaucratic hierarchy of hell staffed by demons who specialize in different forms of human corruption. The comedy of the book depends on recognizing that the principalities and powers Paul describes are simultaneously terrifyingly real and absurdly petty.
1 Peter 5:8 ('Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour') is the verse that Screwtape most embodies. But Lewis's great satiric inversion is that this adversary does not primarily use dramatic temptations - lust, violence, apostasy - but mundane distortions: making the patient irritable at his mother's table manners, gradually replacing genuine prayer with comfortable fantasy, introducing him to friends who will make Christianity seem socially embarrassing.
Matthew 6:5-6 ('And when thou prayest, thou shalt not be as the hypocrites are: for they love to pray standing in the synagogues') and Matthew 6's entire section on genuine versus performed devotion is the basis for Screwtape's most sophisticated advice: don't make the patient obviously irreligious; make him religious in a way that is actually self-serving. Screwtape coaches Wormwood to encourage prayers that are really emotional exercises, church attendance that is really social conformity, and charity that is really vanity.
Romans 7:14-25 (Paul's 'I do not do the good I want to do') provides the psychological framework for Screwtape's understanding of human self-deception. The divided will - knowing what is right but being unable to do it - is Screwtape's primary leverage point. His best letters are those in which he explains how to exploit the gap between the patient's professed values and his actual desires.
Author and Context
Lewis had converted to Christianity in 1931 and spent the decade of the 1930s working through the intellectual and spiritual implications of his conversion in essays, academic work, and the beginning of the Ransom trilogy (Out of the Silent Planet, 1938). By 1941 he was broadcasting on the BBC and had become one of the most recognized voices of popular Christian apologetics in Britain.
The period of The Screwtape Letters - 1941-1942 - was the darkest phase of the Second World War. The book's setting, which includes references to the Blitz and to the patient serving in the army, grounds the spiritual warfare in a very literal war. Screwtape's comment that 'we are gradually winning the battle' against Christianity through the patient drift of modern culture, rather than through dramatic persecution, had obvious topical resonance in a Britain facing an enemy that had achieved dominance through exactly such gradual normalization of evil.
Themes
The book's central insight is that spiritual danger is proportional to spiritual complacency - that the most effective diabolical strategy is not dramatic temptation but the gradual erosion of attention, love, and the capacity for genuine self-knowledge. Screwtape is contemptuous of dramatic sin; what he wants is the slow shrinkage of the soul, the replacement of the real with a comfortable simulacrum.
The letters address, in turn: the deformation of reason by special pleading, the corruption of prayer into emotional self-indulgence, the use of social embarrassment to separate the patient from genuine Christianity, the exploitation of romantic love and friendship, the corruption of patriotism into hatred, and the management of the patient's fear of death during the Blitz.
The book's deepest theological argument, embedded in Screwtape's account of God's motives, is that God actually loves human beings and wants their genuine freedom and joy - a desire that the demons find incomprehensible and somewhat disgusting. Screwtape can only interpret God's apparent concern for human flourishing as a disguised form of predation, because his own consciousness is incapable of genuine altruism.
Reception
The book was an immediate success and has remained the most widely read Christian satirical text in the English language. The Archbishop of Canterbury at the time, William Temple, declared it 'the most significant work of religious literature of the first half of the 20th century.' It has been adapted for stage and radio multiple times. A sequel, Screwtape Proposes a Toast (1959), extends the satire to the democratizing tendencies of modern education.
Legacy
The book established the genre of Christian satirical apologetics that proceeds by inhabiting the perspective of the enemy. Its influence on evangelical piety has been profound: it gave a generation of Christians a vocabulary for naming the mundane spiritual dangers - distraction, self-deception, the gap between stated belief and actual practice - that formal theology rarely addresses. The phrase 'Screwtapean' has entered theological usage to describe exactly this category of subtle spiritual corruption.