As we do today, Jesus' first followers struggled to define this awesome divine-human Person. They called Him Messiah, Christ, Son of God, Savior, Lord. I like that term, too, and will use it to describe five steps in becoming a Christian. But first consider the term. Light penetrates darkness, enabling us to see our way.
Light brings warmth.
In fact, it is basic to physical life. Well, this at least, that His ways of love and truth are as central to life as the sun, and that neither the coldness or hate nor the darkness of deceit can overcome them. Light overcomes darkness. Good overcomes evil. Jesus was put to death on a Roman cross.