Matthew Henry Commentary 2 John 1:12-13

"Having many things to write unto you, I would not [write them] with paper and ink: but I hope to come unto you, and to speak face to face, that your joy may be made full. The children of thine elect sister salute thee." — 2 John 1:12-13 (ASV)

The apostle often reserves many matters for discussion in a personal meeting. Pen and ink are means of strengthening and comforting others; but seeing each other is even more so. The communion of saints should be maintained by all methods, and should foster mutual joy. In communion with them, we find much of our present joy and look forward to happiness forever.