Commentaries:
Robertson's Word Pictures (NT)
If ye know (ean eidhte). Third-class condition again with ean and second perfect active subjunctive of oida. If ye know by intuitive or absolute knowledge that Christ (because of verse I John 2:28) is righteous, then "ye know" or "know ye" (ginwskete either indicative or imperative) by experimental knowledge (so ginwskw means in contrast with oida).
Is begotten (gegennhtai). Perfect passive indicative of gennaw, stands begotten, the second birth (regeneration) of John 3:3-8.
Of him (ec autou). Plainly "of God" in verse I John 2:9 and so apparently here in spite of dikaiov referring to Christ. Doing righteousness is proof of the new birth.
Other Robertson's Word Pictures (NT) entries containing 1 John 2:29:
1 John 3:1
1 John 3:4
1 John 4:7
1 John 5:1
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