Albert Barnes on 3 John 1:13

I had many things to write, etc. This epistle closes, as the second does, with a statement that he had many things to say, but that he preferred waiting till he should see him rather than put them on paper. Perhaps there were some things which he wished to say which he would not like to have exposed to the possibility of being seen by the public eye.

But I will not with ink and pen, etc. 2Jn 1:12.