Jan G. van der Watt analyses in detail the ethics of John's Letters against their respective socio-historical backgrounds. He then compares the ethics of the Gospel and Letters, showing that the basic core narrative overlaps in these writings, although some ethical material is applied in different ways to different situations. A rich ethical landscape is revealed, addressing issues like the importance of inter-personal relations, which results in co-operation through mutual love. The author shows that the focus in 1 John is pastoral, aiming at convincing the addressees not to be deceived by the schismatics but to strengthen their relationship with the eyewitness group. In 2 John, advice is given about visitors who threaten the church with false teachings, while 3 John deals with a conflict about receiving travelling missionaries. In both cases ethical guidelines are given which aim at protecting the group.