In a gathering of people sometimes there are people who speak ill of others who are not there. If you've done this, how did you feel about it? You might have felt badly about it afterwards. If you had made kind and lovely conversation, you would not have felt bad. It is very common for people to see the speck in a brother's eye, but not to see the log in their own. It can lead to passing judgment and condemnation. Not only is it absolutely unnecessary, but as recorded in Matthew 7:5 it is wrong. We can have peace and make the world peaceful and even beautiful by encouraging and praising one another.