Php 3:18 (For many walk, of whom I have told you often, and now tell you even weeping, that they are the enemies of the cross of Christ:
Php 3:19 Whose end is destruction, whose God is their belly, and whose glory is in their shame, who mind earthly things.)
And here's a happy parenthetical regarding those who are walking along with us but aren't really following Jesus. He's talked about them before and he's quite upset on their account, because their end is in destruction. We should weep for them as we care about them and their souls, and what will happen to them after this life.
He cautions against minding earthly things, and placing more importance on the flesh (what our bodies want) than on God (and His perfect wisdom). They glory in things that should be found shameful. Turn on MTV to see what this looks like.