Read this again carefully. And instead of being a prohibition against honest judgment, it is a solemn warning against hypocritical judgment. If we take a verse or a part of a verse out of its setting, we can make the Word of God appear to teach the very opposite of what it really does teach. Let this be a warning to us never again to take a text of Scripture out of its context. The reason the professed church of Christ is today honeycombed and paralyzed by satanic Modernism is because Christians have not obeyed the commands of God's Word to judge and put away and separate from false teachers and false teaching when they first appeared in their midst.
Physical health is maintained by separation from disease germs.
Spiritual health is maintained by separation from germs of false doctrine. The greatest peril of our day is not too much judging, but too little judging of spiritual falsehood. The Bible never contradicts itself. To understand one portion of Scripture we must view it in the light of all Scripture. When we obey God's Word, we can trust Him to take care of all the consequences of our obedience.