Matthew 7:1-2, "Judge not, that you be not judged." Now we know from the rest of the New Testament, He did not say we cannot condemn sin because He got on the churches in Revelation because they were allowing sin in their churches, some of them anyway. "For with what judgment you judge, you will be judged, and with the measure you use, it will be measured back to you." So in other words, He's saying, "Hey, you get to choose how you're going to be judged on Judgment Day. If you want to be judged harshly, okay.
Just go around judging everyone else harshly."