² tn The phrase ἐκ τούτου (ek toutou) in 4:6, which bears obvious similarity to the much more common phrase ἐν τούτῳ (en toutw), must refer to what precedes, since there is nothing in the following context for it to relate to, and 4:1-6 is recognized by almost everyone as a discrete unit. There is still a question, however, of what in the preceding context the phrase refers to. Interpreters have suggested a reference (1) only to 4:6; (2) to 4:4-6; or (3) to all of 4:1-6. The last is most likely, because the present phrase forms an inclusion with the phrase ἐν τούτῳ in 3:24 which introduces the present section. Thus “by this we know the Spirit of truth and the spirit of deceit” refers to all of 4:1-6 with its “test” of the spirits by the christological confession made by their adherents in 4:1-3 and with its emphasis on the authoritative (apostolic) eyewitness testimony to the significance of Jesus’ earthly life and ministry in 4:4-6.