“I am the light of the world. Whoever follows me will never walk in darkness, but will have the light of life.” (John 8:12) 

Jesus is the light of the world because His words ring true in all corners of the world.  By the power of the Holy Spirit, the seed of God’s Word has been sown in various cultures since the creation of the world.  For example, Confucius taught, “ ‘Don't do unto others what you would not have them do unto you’ and ‘All within the four seas will be his brothers’. ”  Do these precepts not resound with the Gospel, “ ‘And just as you want men to do to you, you also do to them likewise’ and ‘You have one Father, who is in heaven, and you are all brothers and sisters’.”  Of course, only Jesus taught us to love our neighbours by examples to the point of sacrificing His own life.
Jesus is the light of life because His life is the life of the Holy Trinity.  The relationship of the Holy Trinity is one of mutual love.  Only in this mutual love can one live life truly.  When we can wholeheartedly accept and sincerely listen to others, we naturally have “light” and “courage” with us.