Adam Clarke's Commentary on the Bible

Verse 12 (1 John 4:12)

No man hath seen God at any time - The very words, with the change of ἑωρακε for τεθεαται , of this apostle in his gospel, John 1:18 . We may feel him, though we cannot see him; and if we love one another he dwelleth in us, and his love is perfected in us - it has then its full accomplishment, having moulded us according to its own nature.

- Adam Clarke's Commentary on the Bible