In the same way, there is joy in the presence of God’s angels when even one sinner repents.
Sin is a scourge that plagues humanity, from the first sinful act of Adam to the present day. Our nature is sinful and it is only through Christ that we have redemption. For those that wonder how God feels about the human race he created, this verse gives us a hint. That the multitude would rejoice every time one sinner repents should give us comfort, the whole of heaven is mindful of every new believer.