"By this all people will know that you are my disciples, if you have love for one another." If you have love one for another. . .the evidence The certainty, the tangible awareness of who are the people of God is the love we express toward each other. Kind. Tenderhearted. Forgiving. Our flesh doesn't possess those attributes. Even if you have a temperament that is less given to offending other people. It requires a work of the Holy Spirit for you to be truly forgiving, or truly loving, truly kind. And we stand in need of that because this is a direct instruction to us from the Lord through His Apostle that this is how we are supposed to be. This is the sort of people we're supposed to be. Kind, tender-hearted, forgiving.