Facing a difficult situation? You need to release the shout of the Lord.
According to the rules of proper grammar, exclamation marks should be used rarely, and only when conveying extreme emotion. I'm sure you agree there is nothing more annoying than an article or e-mail FILLED WITH ALL CAPS AND PROFUSE EXCLAMATIONS!!! An overuse of such punctuation is the journalistic equivalent of screaming in a public library.
Yet exclamation marks do appear in the Bible, especially in the Psalms. Apparently there are times in our spiritual lives when extreme emotion and pumped-up volume are necessary.