28 Grk “by means of.”
29 Grk “ink and pen.” The more normal order in contemporary English is “pen and ink.” The figurative phrase with pen and ink is parallel to 2 John 12, suggesting that both letters may well have been written at approximately the same time and in similar situations. The author tells Gaius that he has more to say, but does not wish to do so in writing; he would rather talk in person (3 John 14). It appears that the author anticipates a personal visit to Gaius’ church in the very near future. This may be the same visit mentioned in connection with Diotrephes in v. 10. Gaius’ church and Diotrephes’ church may have been in the same city, or in neighboring towns, so that the author anticipates visiting both on the same journey.

In other versions

I had much to write to you, but I would rather not write with pen and ink.

I have much to write you, but I do not want to do so with pen and ink.

I have many things to write you, but I don’t want to write to you with pen and ink.

I have much more to say to you, but I don’t want to write it with pen and ink.

I have many things to write to you, but I do not want to write to you by means of ink and pen.

I had many things to write, but I will not with ink and pen write unto thee:

Public Domain