<p>1:7- see on&nbsp;Lk. 1:14.</p><p><em>This one came as a witness to testify about the light, so that all might believe in the light</em>- Potentially, all Israel could have believed in the light and been saved. John's mission could have been totally successful; but human beings were allowed their freewill, and so that potential wasn't realized. The Gospel of John is a transcript of his preaching of the gospel, and it seems that he was involved with preaching to converts of John the Baptist. He writes to his converts perhaps alluding to this by saying that although they had believed / received the witness of men, i.e. John the Baptist, they needed to accept that the far greater witness to the Lord Jesus was that given by God in the gift of the Spirit, the life of Jesus within them (1 Jn. 5:9,10,11). This general scene is not unknown today- those who say they are convinced Jesus is the Messiah because He fulfilled prophetic witness about Himself; and yet they are apparently resistant to receiving the gift of His Spirit within them.</p>