{If ye know} (ean eid(8874)e). 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  28 ) is righteous, then "ye know" or "know ye"
(gin(9373)kete either indicative or imperative) by experimental
knowledge (so gin(9373)k(935c) means in contrast with oida). {Is
begotten} (gegenn(8874)ai). Perfect passive indicative of genna(935c),
stands begotten, the second birth (regeneration) of  Joh 3:3-8 .
{Of him} (ex autou). Plainly "of God" in verse  9  and so
apparently here in spite of dikaios referring to Christ. Doing
righteousness is proof of the new birth.