Jesus said how to know if you are born of the Spirit

Jesus told Nicodemus no one can enter the Kingdom of Heaven unless he is born of water and of the Spirit. You must be born again! I have been reading a lot of blogs lately, from especially one pastor that keeps trying to justify why he has sinners in his ministry and insist he cant have church with out them. Believe me I know as well as the next person that none of us are perfect. Seriously! We are human and we are made to fall. But should we not strive to remain blameless before the Lord? Especially if we are in Ministry. We are in leadership, shepards over the church, under the pastor who is under Jesus. None of us are perfect but if we allow people who blatantly sin in leadership, what are we telling the world? 1 Corinthians 5 says expel the immoral brother and let him get his junk worked out. Paul tells us not to judge the world but to definitely judge each other in the church! Just my opinion....