1 John 2:4

The previous statement is enforced by denying the opposite of it. The construction, -he that saith," -he that loveth," &c. now takes the place of -if we say," -if we walk," &c., but without change of meaning; and this continues down to 1 John 2:11, after which both constructions cease and a new division begins. Comp. 1 John 1:6, which is exactly parallel to this: -to know Him" = -to have fellowship with Him," and -not to keep His commandments" = -to walk in darkness."

and keepeth not By the negative which he uses (μή) S. John states the case as gently as possible, without asserting that any such person exists (see on 1 John 2:10).