A lot of believers hear condemning thoughts, and some believers even think it's God telling them these things. My friend, nothing could be further from the truth! God NEVER tells you what a loser you are. Jesus said He came not to condemn the world, but to save it (John 12:47)!
What is condemnation?
Condemnation comes from Satan and is meant to tear you down. Condemnation continually points out what a failure you are, and how badly you've messed up. Condemnation is showing you the problem, but avoiding the solution.
Jesus did NOT come to condemn the world (John 12:47). There is no condemnation in Christ Jesus (Romans 8:1). Satan on the other hand is KNOWN for accusing the brethren (Rev 12:10).
Why won't you ever hear God telling you what a failure you are? Because Jesus said, "I came not to judge the world, but to save the world." (John 12:47)
What is conviction?
Conviction is known in the Bible as Godly sorrow. God's Word tells us that Godly sorrow is what leads us to repentance (Romans 2:4). Condemnation tells you, "You are such a failure! Look at what you did!" while conviction tells you, "Come to me... and I will forgive you!"
Not only is God willing to forgive your sins, but He longs (deeply desires) to do so! Isaiah 30:18, "Therefore the LORD longs to be gracious to you, And therefore He waits on high to have compassion on you. For the LORD is a God of justice; How blessed are all those who long for Him." (NASB)
1 John 1:9, "If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from ALL unrighteousness."
Romans 2:4, "Or despisest thou the riches of his goodness and forbearance and longsuffering; not knowing that the goodness of God leadeth thee to repentance?"
Conviction shows you the answer to your problem. Conviction shows you the blood of Jesus that wipes away your sins!
What is the difference?
Conviction shows you the answer (the Blood of Jesus, which washes away sin), while condemnation shows you the problem (the sin, the past and your failures). Condemnation shows you the problem, but conviction shows you the answer.
Condemnation shouts, "Your past! Your sins! You loser!" But conviction shouts, "The Blood of Jesus washes away sins! Come to Jesus and be forgiven of your sins! You can be forgiven! Your sins and past don't have to be a part of you anymore!"