If a man say (εαν τις ειπη). Condition of third class with εαν and second aorist active subjunctive. Suppose one say. Cf. 1. John 1:6.

I love God (Αγαπω τον θεον). Quoting an imaginary disputant as in 1. John 2:4.

And hateth (κα μισε). Continuation of the same condition with εαν and the present active subjunctive, "and keep on hating." See 1. John 2:9; 1. John 3:15 for use of μισεω (hate) with αδελφος (brother). A liar (ψευστης). Blunt and to the point as in 1. John 1:10; 1. John 2:4.

That loveth not (ο μη αγαπων). "The one who does not keep on loving" (present active negative articular participle).

Hath seen (εωρακεν). Perfect active indicative of οραω, the form in John 1:18 used of seeing God.

Cannot love (ου δυνατα αγαπαιν). "Is not able to go on loving," with which compare 1. John 2:9, ου δυνατα αμαρτανειν (is not able to go on sinning). The best MSS. do not have πως (how) here.