Luke 1.29-32: “Lord, now you are letting your servant depart in peace, according to your word; (30) for my eyes have seen your salvation (31) that you have prepared in the presence of all peoples, (32) a light for revelation to the Gentiles, and for glory to your people Israel.” (ESV)
The above words were spoken by a man named Simeon who was in the temple in Jerusalem when Jesus’ parents brought him in to fulfill the custom of the Law. In verse 25 it says that Simeon was righteous and devout, and the Holy Spirit was upon him. At this time in Bible history prior to the day of Pentecost recorded in the first chapter of Acts, it was very rare for the Holy Spirit to be “upon” a person. I don’t think we really understand all of what it means for the Holy Spirit to be upon someone, but from reading the actions of the apostles in the Book of Acts, it means in part that the Holy Spirit is empowering, guiding, and directing a person’s life and behavior. So the verses above are understood as a prophecy given through Simeon inspired by the Holy Spirit regarding Jesus.
The name “Jesus” means salvation, and so his name describes the reason for which he was born. Jesus himself said in John 3.17, “For God did not send the Son into the world to judge the world, but that the world should be saved through Him.” (NASB) Simeon affirms for all of time that Jesus is the fulfillment of all prophecies in the Old Testament regarding the Messiah, and Jesus is the light shining in the darkness so that all people may understand the true way of salvation in Him.