Jude 1:6 (ESV)

6 And the angels who did not stay within their own position of authority, but left their proper dwelling, he has kept in eternal chains under gloomy darkness until the judgment of the great day

Those angels that rebelled against God and against the purposes of God, were saying to God, I am not happy with being a servant. I do not want to be a servant. I want to be a king; a master. I want to have a domain to rule over. It was pride that got in the way of the angels as they lifted themselves up, left their own domain, and abandoned their proper abode as servants of God. And what happens to the angels? What does Jude say? God has kept these angels in eternal bonds under darkness, for the judgment of the Great Day. God has kept the disobedient angels under darkness. In a prison, the worst punishment that an inmate may undergo is solitary confinement. In solitary confinement, an inmate is placed in a small cubicle in the dark for an extended period of time. In a small cubicle alone in the dark. Do you get it? One of the pictures of hell that is given in the Bible is eternal darkness. The opposite is heaven, right? And what is heaven? Ineffable light; the grace of the light of God. One of the best ways we learn, is by way of contrast. And when we get the contrast between light and darkness, we get something very significant from Scripture.1  

Dennis Prutow