3Now by this we know that we know Him, if we keep His commandments. 4He who says, “I know Him,” and does not keep His commandments, is a #Rom. 3:4liar, and the truth is not in him. 5But #John 14:21, 23whoever keeps His word, truly the love of God is perfected #(1 John 4:12)in him. By this we know that we are in Him. 6#John 15:4He who says he abides in Him #Matt. 11:29; John 13:15; 15:10; 1 Pet. 2:21ought himself also to walk just as He walked.7Brethren, I write no new commandment to you, but an old commandment which you have had #John 13:34; 1 John 3:11, 23; 4:21; 2 John 5from the beginning. The old commandment is the word which you heard from the beginning. 8Again, #John 13:34; 15:12a new commandment I write to you, which thing is true in Him and in you, #Rom. 13:12; Eph. 5:8; 1 Thess. 5:4because the darkness is passing away, and #(John 1:9; 8:12; 12:35)the true light is already shining.9#(1 Cor. 13:2); 1 John 3:14He who says he is in the light, and hates his brother, is in darkness until now. 10#(1 John 3:14)He who loves his brother abides in the light, and #2 Pet. 1:10there is no cause for stumbling in him. 11But he who #(1 John 2:9; 3:15; 4:20)hates his brother is in darkness and #John 12:35; 1 John 1:6walks in darkness, and does not know where he is going, because the darkness has blinded his eyes.12I write to you, little children,Because #(1 Cor. 6:11)your sins are forgiven you for His name’s sake.13I write to you, fathers,Because you have known Him whois#John 1:1; Rev. 22:13from the beginning.I write to you, young men,Because you have overcome the wicked one.I write to you, little children,Because you have #(Rom. 8:15–17; Gal. 4:6)known the Father.14I have written to you, fathers,Because you have known Him whois from the beginning.I have written to you, young men,Because #Eph. 6:10you are strong, and the word of God abides in you,And you have overcome the wicked one.15#(Rom. 12:2); Gal. 1:4; James 1:27Do not love the world or the things in the world. #Matt. 6:24; James 4:4If anyone loves the world, the love of the Father is not in him. 16For all that is in the world—the lust of the flesh, #(Eccl. 5:10, 11)the lust of the eyes, and the pride of life—is not of the Father but is of the world. 17And #1 Cor. 7:31; 1 Pet. 1:24the world is passing away, and the lust of it; but he who does the will of God abides forever.