John’s purpose in writing his gospel account was to convince people that Jesus was who He said He was: the Messiah, God incarnate come to save mankind from sin. The evangelist cites John the Baptist as one of those first witnesses to this as were the first disciples whom Jesus called.
When John the Baptist proclaimed Him the Lamb of God he was proclaiming that the Messiah is God’s own sacrificial Lamb whose blood would be shed to atone for the sins of every human being. Not all would agree, particularly the rulers of the Jews, the ones who held religious authority and administered the Law of Moses. Though they claimed to walk in the light they were dwelling in spiritual darkness. While it was true that they looked for the Messiah, they were not looking for a sacrificial lamb. They expected a warrior who would throw off the yoke of Roman oppression and establish a new and victorious nation.
Today as well s 2000 years ago, those accept Jesus as their lamb are blessed though perhaps the world would think them cursed or losers, weak, oppressed and downtrodden. The world scorns such as delusional and irrelevant for they know they are sinners who, contrary to the ideals of the world, can fo nothing to help themselves. The good news is that though we cannot keep the Law Jesus kept it for us by becoming the Lamb of God. These no longer dwell in darkness, but in the light of God’s truth revealed in the Word. Our duty is to share that light with everyone else so they would not dwell in that unbearable darkness of an eternity apart from God.