Lit., coming. The present participle denotes coming from time to time, and not coming on a single occasion, which would require the aorist. On brethren, see on 1Jo 2:9.
Thou walkest in truth
See on 1Jo 1:8. for the phrase walk in, see on 2Jo 1:6. Thou is emphatic, suggesting a contrast with less faithful ones, as Diotrephes, 3Jo 1:9.