Literally, concerning. Rev., in respect of. Of gives a wrong impression, viz., that He will convict the world of being sinful, unrighteous, and exposed to judgment. This is true, but the preposition implies more. He will convict the world as respects these three; that is, will convict it of ignorance of their real nature.
Righteousness (δικαιοσύνης)
Only here and Joh 16:10 in the Gospel. It occurs in the First Epistle and in Revelation.