Again, therefore, Jesus spoke to them, saying, “I am the light of the world. He who follows me will not walk in the darkness, but will have the light of life.” John 8:12 WEB
If you need light in your life, be cautious where you're walking. Watch what you allow in your ear-gates and eye-gates and check your drama-meter?
What about what comes from your mouth-gate? Is it negative or positive? We say in the computer world garbage in, garbage out.
Are you thinking on whatsoever things are true, honorable, just, pure, lovely and of a good report? The bible says, think on those things (Philippians 4:8).
"For as he thinketh in his heart, so is he:" Proverbs 23:7 (KJV)