Romans 1:28b

Furthermore, since they did not think it worthwhile to retain the knowledge of God, he gave them over to a depraved mind, to do what ought not to be done. Furthermore, since they did not think it worthwhile to retain the knowledge of God, he gave them over to a depraved mind, to do what ought not to be done.

(v28, NIV)

What does a depraved mind mean? Well, looking it up, depraved means to be morally corrupt or perverted. I'd like to think that in this North American society, we think we know everything. We think we're so smart and are able to use our brains to figure everything out. Sometimes people are thinking that they're so smart when they decided to make up their own God or philosophy on life. They rationalize their morality and how they are to live. Unfortunately, that's part of a depraved mind. They think they're wise, but they're really not. This mind is not an objective observer with which we can use to help us live morally. When given over to a depraved mind, the mind aids in our sinfulness. The mind will help rationalize sin and find ways to justify our filthy deeds. This is what happens, and it's disgusting.

Note: I'm going away, so next few days I may write it out day by day then type it up when I get back.