From a blog I follow called The Deliberate Agrarian comes this insightful quote:
"Pastor Steve Berger makes it clear that there are two kinds of judgement in the Bible. One is judgement that condemns, and the other is judgement that discerns between right and wrong, based on God's law (the Bible). Only God has a right to judge with condemnation. Christians are called to judge with righteousness and compassion."
Too often we told we shouldn't judge others; we are reproached for doing so; we are called haters, bigots, racist, and worse. But Jesus never commanded that we not discern right from wrong; only that we not judge to condemn, which is His prerogative alone.
We can, indeed we must discern good from evil if we are to avoid evil and follow the strait and narrow path.