“Here is the judgment. Light has come into the world, but people loved darkness instead of light. They loved darkness because what they did was evil.
"Everyone who does evil things hates the light. They will not come into the light. They are afraid that what they do will be seen.” John 3:19-20 NIRV
Verses 19 and 20 are not written just for "really bad people." Any person who is afraid to be changed by Christ stays in the darkness where thoughts, words, and actions are unexposed. Even though they may believe that Jesus is indeed the Son of God, they will not give Him full control of their lives for fear that they will have to change their lifestyle.
Evil is uncomfortable in the light. It likes darkness:
“These wrongdoers are of those who rebel against the light; they know not its ways nor stay in its paths.
The murderer rises with the light; he kills the poor and the needy, and in the night he becomes as a thief.
The eye also of the adulterer waits for the twilight, saying, No eye shall see me, and he puts a disguise upon his face.
In the dark, they dig through [the penetrable walls of] houses; by day they shut themselves up; they do not know the sunlight.
For midnight is morning to all of them; for they are familiar with the terrors of deep darkness.” Job 24:13-17 AMP
The person who loves the darkness rather than the Light is deceived. Say a heroin addict is offered a free rehabilitation program that is guaranteed to work, but turns it down because he does not want to give up heroin. He is deceived into remaining in his present lifestyle, enslaved to the drug, instead of receiving freedom from it.
A successful businessperson could be another example--refusing to commit his life to Christ for fear that he may have to give more money, work fewer hours, or give up his business to become a missionary.
Satan is crafty. He is an expert at tricking people out of the spiritual riches and awesome joy that Jesus offers.
“They do not believe, because their minds have been kept in the dark by the evil god of this world. He keeps them from seeing the light shining on them, the light that comes from the Good News about the glory of Christ, who is the exact likeness of God.” II Cor. 4:4 GNT
Do not be deceived. There is nothing on this earth that is better than knowing Christ.
God wants you to come and let Him change your desires. Come to the Light and let God expose your sinfulness, trusting Him to change you. Over time you will lose the desire for the things or lifestyle that you were once afraid to give up.
You will find that Christ Himself will fill you with joy, and that the things of this world, which once seemed so attractive, are actually obstacles to the real joy that is in Christ.