“Therefore thou art inexcusable, O man, whosoever thou art that judgest: for wherein thou judgest another, thou condemnest thyself; for thou that judgest doest the same things.” (Romans 2:1)
Many Christians use Romans 2:1 as a proof text to outlaw judging others, however that is not a proper rendering of the verse. What this portion of 
Scripture does is warn us that we are never to judge someone condemningly, that is to hell, and it outlines the dire consequences if we do.
Scripture does is warn us that we are never to judge someone condemningly, that is to hell, and it outlines the dire consequences if we do.There are two reasons why we cannot condemn others: only God has that authority and we once were in sin, and by God’s mercy and grace, He saved us. Therefore we cannot ever declare to an active sinner, “You are going to hell,” because we are not omniscient (like God) and we don’t know if the sinner in question will receive the grace of God, as we once did.
What can we judge?
Essentially there two permissible types of judgement: judging for the purpose of identification and judging for the purpose of restoration. When we judge to identify, we might say or observe that a person is drunk, or a person is gossiping, and wisely determine that we should stay away from that kind of activity. And when we judge to restore, we’re looking for the opportunity to assist that person who is involved in sin, hoping that such help will ultimately lead to repentance. We will know which to do, identify or restore, by the working of the Holy Spirit.
“Now I rejoice, not that ye were made sorry, but that ye sorrowed to repentance: for ye were made sorry after a godly manner, that ye might receive damage by us in nothing. For godly sorrow worketh repentance to salvation not to be repented of: but the sorrow of the world worketh death.” (2 Corinthians 7:9-10)
Can we mention Hell?
The short answer is yes. While we can never point a finger in a sinner’s face and declare, “You’re going to Hell!” it is proper, in the context of a restorative conversation, to tell a person that “The wages of sin is death (hell); but the gift of God is eternal life through Jesus Christ our Lord.” (Romans 6:23)
What about the log in our eye?
Jesus teaches…
“Why do you look at the speck that is in your brother’s eye, but do not notice the log that is in your own eye?” (Matthew 7:3)
Sinful human beings, Christian and non-Christian, are very good at deflecting light. If we are in bondage to sin, the easiest way to hide it is to put the spot light on someone else. Jesus calls that hypocrisy. But having said that, if a drunk is telling you that you’re drinking too much, maybe you should listen.
“Judge not, that ye be not judged. For with what judgment ye judge, ye shall be judged: and with what measure ye mete, it shall be measured to you again.” (Matthew 7:1-2)
Once again, Matthew 7:1-2 is not a proof text for ‘not ever’ judging others, but rather an admonition against judging folks condemningly or hypocritically. I would add that the verse also implies that if you judge someone well, that is to say for the purpose of identification and/or restoration, God will judge you favorably.
He Dwells -- The B'log in My Eye 