9 Concerning sin, because they (the world) do not believe in Me.
Jesus tells us that the Holy Spirit will convict the world about sin, of whatever kind and depth. In particular it is the sin of not believing in Jesus.
When Jesus spoke these words He was facing the worst that an unbelieving world could throw at Him.
We know that one of His disciples had deserted Him and gone over to the world. Judas had stopped believing in Him. It was a time before the Holy Spirit had been poured out by Jesus. That was to happen seven weeks later.
Then would be the time when the world would begin to feel the Holy Spirit convicting them of their sin. It was after Peter preached on the day of Pentecost that we read these words:
 Peter’s words convicted them deeply, and they said to him and to the other apostles, “Brothers, what should we do?”
 Peter replied, “Each of you must turn from your sins and turn to God, and be baptized in the name of Jesus Christ for the forgiveness of your sins. Then you will receive the gift of the Holy Spirit.
 This promise is to you and to your children, and even to the Gentiles, all who have been called by the Lord our God” – Acts 2.37-39 (NLT).
The same conviction of the Holy Spirit is happening all over the world as many people respond and receive Jesus as their Lord and Saviour.
Not believing in Jesus leads to judgement:
Those who believe in Him are not judged, those who do not believe have already been judged, because they have not believed in the name of the one and only Son of God – John 3.18.
Praise God for that the Holy Spirit convicts us of our sin.
There is no need for any of us to suffer the consequences of our own sin. The Holy Spirit leads and prompts us to believe in Jesus as the one who saves us from our sin. It is in Jesus that our sins are washed as white as snow, that our guilt is taken away, and we are clothed with the new clothes of His righteousness.