"While I am in the world, I am the light of the world." (John 9:5)

This statement by Jesus, though very practical, is often misinterpreted. Many have used this statement to put forth that Jesus is the Supreme Being. However, this thesis contradicts so many other statements and actions of Jesus.

Who was Jesus referring to?

For example, who was Jesus speaking about when he said this:
"My teaching is not my own. It comes from Him who sent me." (John 7:16)

Who was Jesus praying to?

And who was Jesus praying to during this occasion:
Going a little farther, he [Jesus] fell with his face to the ground and prayed, "My Father, if it is possible, may this cup be taken from me. Yet not as I will, but as You will." (Matthew 26:39)
Jesus is asking that he do God's will rather than his own will. Does this not indicate two personalities, each with their own will?

Meaning of 'light'

In John 9:5, the word "light" is being translated from the Greek word φῶς (phōs), which means the light of a lamp. The light of a lamp during Jesus' time was critical to see where one was going at night. They didn't have streetlights and cars with headlights. If they wanted to travel at night, they needed to carry a lamp.

So Jesus is comparing himself to the light of a lamp because Jesus is illuminating the darkness of the physical world with Truth for those who hear him and follow him. This light is allowing us to see. He was teaching them about the Supreme Being and how one can re-establish their relationship with God. This interpretation is confirmed by a similar statement of Jesus, made earlier:
"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)
So the type of "light of the world" Jesus is referring to in this verse and in John 9:5 is the knowledge he is giving to those who follow him. "Whoever follows me will never walk in darkness" clearly indicates that he is offering his guidance as a teacher, because to "follow" in this context means to follow instructions.

Where to focus

Jesus' instructions to his students related to where to focus our lives. Specifically, not focusing on the things of this fleeting physical world and this temporary physical body. These are full of the darkness of ignorance.

And Jesus' primary instruction was related to where we should place our heart and where we should place our focus in life:
“ ‘Love the Lord your God with all your heart and with all your soul and with all your mind.' This is the first and greatest commandment.” (Matt. 22:37-38)