When John was an old man, and probably in gaol on Patmos, he wrote to his friend Gaius in Ephesus a short letter essentially about three things, but there is a fourth hidden there also which lies behind all three.
It is a personal letter, and the manner in which he writes, hiding in some ways the matter of the things of which he is speaking, makes it clear that he wanted the letter to get to Gaius even if it meant that he would have to leave Gaius to make an intelligent guess about what he meant. Gaius knew John. He would know what John meant even if the uninformed reader did not.
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