Letter 19 Themes: God’s love, competition, being in love, marriage, exploitation of anything for sinister purposes. Screwtape-Letters_-19Download Letter 20 Themes: Attacks on chastity; unequally yoked marriages; sexual “tastes” of males and females; idealism. Screwtape-Letters_-20Download Letter 21 Themes: Irritability (peevishness); sense of entitlement; value of time; ownership verses stewardship....