Obadiah is the shortest book in the Old Testament but it is packed with some real good zingers. The one quoted above speaks volumes if we listen. If we catch ourselves feeling prideful we've already deceived ourselves, taken credit for things that we shouldn't take credit for. Yes, we accomplish things and it is okay to acknowledge the good we do but we must do it humbly for that is the only honest way to do it. Without God there is no good. All good things come from God (check out the first chapter of James). Even people who don't believe are covered in a sense with God's protection. As long as the Holy Spirit is in the world, evil is held back from what it wants to accomplish. Yes, there is lots of evil, but once the Holy Spirit leaves the evil of today will be nothing in comparison.
One more zinger from this book, verse 12:
"Do not gloat over your brother's day, the day of his misfortune. And do not rejoice over the sons of Judah In the day of their destruction, Yes do not boast In the day of their distress."
I think this sometimes happens in Christiandom. A big celebrity Christian falls and some of the unknowns gloat. Rather than grieve for our brother or sister we cheer. This should not be.