It’s important for a Christian to constantly judge himself. His conduct, his motives, everything he does, thinks, and says needs to be monitored. This is especially important towards other believers. If he truly judges himself correctly, it will eliminate the need for God to judge him. God’s righteous judgement comes with both discipline and consequences.
To correctly discern the Body Of Christ, is to treat the body of believers as though they were literally God’s Holy Son by extension. Could you imagine cheating, belittling, or lying to Jesus Christ? The incurred wrath of God would most certainly have some physically consequences. How easily we forget that God not only has control over the spiritual realm, but also the physical. It shouldn’t be too difficult to comprehend sickness or death, following God’s judgement of our imputance. It would follow that we should be careful how we treat fellow believers, especially when sharing the sacraments without first self examining our attitude towards such a holy crowd of witnesses.
The purpose in all of is that because of His great love for His children, He wants to spare them the finality of the condemnation the rest of the world will receive. We are assured that we are His children, when we sense His discipline. We sense His pleasure, when we judge ourselves.
1 Corinthians 11:29
For anyone who eats and drinks without discerning the body eats and drinks judgment on himself.
30 That is why many of you are weak and ill, and some have died.
31 But if we judged ourselves truly, we would not be judged.
32 But when we are judged by the Lord, we are disciplined so that we may not be condemned along with the world.