1 John 2:3 - 11
3 By this we know that we have come to know Him, if we keep His commandments.
4 The one who says, "I have come to know Him," and does not keep His commandments, is a liar, and the truth is not in him; 5 but whoever keeps His word, in him the love of God has truly been perfected. By this we know that we are in Him: 6 the one who says he abides in Him ought himself to walk in the same manner as He walked. 7 Beloved, I am not writing a new commandment to you, but an old commandment which you have had from the beginning; the old commandment is the word which you have heard. 8 On the other hand, I am writing a new commandment to you, which is true in Him and in you, because the darkness is passing away and the true Light is already shining. 9 The one who says he is in the Light and yet hates his brother is in the darkness until now. 10 The one who loves his brother abides in the Light and there is no cause for stumbling in him. 11 But the one who hates his brother is in the darkness and walks in the darkness, and does not know where he is going because the darkness has blinded his eyes.
A lot of people say a lot of things, but often, works tell a different story. John insists that you can say you have to come to know Him, but if you don’t keep His commandments, you’re a liar, and the truth is not in you.
On the other hand, if you keep His word, the love of God is truly perfected in you. If you’re going to say you abide in Him, you ought to walk in the same manner as He walked.
So really there are two characteristics of true believers that validate their testimony:
They obey God, 2.
They love other believers.
Someone may say he is in the Light, yet hates his brother, he is in the darkness until now. The one walking in the Light provides no cause for stumbling because he sees where he is going and goes where he is seeing.