Jamieson, Fausset & Brown

say--profess. have fellowship with him-- (Jo1 1:3). The essence of the Christian life. walk--in inward and outward action, whithersoever we turn ourselves [BENGEL]. in darkness--Greek, "in the darkness"; opposed to "the light" (compare Jo1 2:8, Jo1 2:11). lie-- (Jo1 2:4). do not--in practice, whatever we say. the truth-- (Eph 4:21; Joh 3:21).