Many use Matthew 7:1-6 to push away anyone that makes an observation. They might even quote verse one “Judge not, that ye be not judged.” We often do this without understanding the difference between judgement and discernment. Instead of using this scripture to simply quote Jesus, we use it for our own justification. That was never what Jesus would have us use His words to do.
Discernment and judgement are two very different things. Both can result in action. One is personal or internal and the other is projected upon another or external. When one discerns a danger, they take actions to avoid it. When one judges a danger, they take actions against it and compel others to join them.
Is there a just time to judge? Should we never judge, but only discern? Those are tough questions. First principle, tell the truth in love (Eph. 4:15). That is selfless, agape love. Never judge because of personal issues. One can judge another as a sinner, but not because they commit what an individual considers the most reprehensible sin, but as a simple fact in scripture. That is the second principle, judge only as the Father judges through His word
all have sinned and come short of the glory of God (Romans 3:23)
Love points out that this is not an escape clause. Love then shares the escape route – through the salvation of Jesus Christ.
Ultimately, look internally first (mote/beam in Luke 6:42). We should make decisions upon ourselves more than upon others. Jesus is the only just judge. In John 5:30 He would only judge with the Father’s approval, guidance and direction. We have His word for that. Do not forget, Jesus primary calling, to love one another as He loves us and gave himself for us (John 13:34). When you have sacrificed yourself for your fellow man, then you can judge them (1 Cor 6:1-5).