Every human being judges another person’s character, or food, places, jobs etc. This is true because God made us in His image, which means we are called to evaluate everything around us, and make good use of our discernment. But Jesus prohibits one kind of judgment which we are prone to commit, listen to the sermon to learn more on this topic.
In the Bible, God sets aside His redeemed people primarily to fellowship with Him and to glory Him by reflecting His character through His people in this world. God is glorified when His redeemed people show certain marks that remind the world about God and His kingdom. In this passage, we learn how sincere love for others and constantly fighting sin in our lives through repentance and overcoming temptation, are the ongoing marks of a true Christian.