 It was here that he wrote his first book "Kristi kyrka" (translated by Hans O. Andrae as "Christ’s Church").Giertz’s first regularly assigned parish was in Torpa, where he served as assistant vicar from 1938 until his election as bishop in 1949.Here he authored many theological works including "Kyrkofromhet" ("Ecclesiastical piety", which was published with "Kristi kyrka" in 1939); "Den stora lögnen och den stora sanningen" ("The great lie and the great truth", 1945); "Kampen om människan" ("The Battle For Man", 1947); "Stengrunden" (“The Hammer of God”, 1941); and "Tron allena" (“Faith Alone”, 1943).