Bible Quote Sep 26th 1 John 2:1

“My dear children, I write this to you so that you will not sin. But if anybody does sin, we have an advocate with the Father—Jesus Christ, the Righteous One.” 1 John 2:1 
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John had been close to Jesus. He had thought, for a long time, that Jesus had promised John would never suffer mortal death. But God keeps all of his promises. In some ways, John died at least twice. Killed by Romans who wanted to silence his cult, John survived and died later, possibly of old age. He wrote this letter in Ephesus probably around the year 98.

John and Peter, of all the disciples had a special relationship with Jesus. Jesus even allowed them time to commune with Elijah and Moses. John writes in a particular style that is also evident in his letters and in Revelations. Earlier, John had written that Jesus was the Word made flesh. That flesh was sacrificed by God, as a gift to those whom God loved, so that God could abide them Because eternal life is close proximity to God. And to perish is to be utterly riven from God.

Here, we are told of the advocate we have when we sin. 

"My dear children, I write this to you so that you will not sin. But if anybody does sin, we have an advocate with the Father—Jesus Christ, the Righteous One. He is the atoning sacrifice for our sins, and not only for ours but also for the sins of the whole world."

Read David Daniel Ball's answer to What is the background to, and meaning of 1 John 2:1? on Quora