Ever since I was little, God has been teaching me the same lesson over and over again. My growth has been slow and nearly imperceptible at times, but God has not flagged in his insistence that I learn to tame my tongue.

The process has been painful, to say the least. I have a mortifying memory of smart-mouthing a high school teacher and a number of cringe-worthy interactions with famous people. I have grossly miscommunicated myself through e-mail, offended friends and family with too much honesty, and generally embarrassed myself by over-sharing. Over time I recognized this pattern as a real problem, so I launched a spiritual offensive against it. Drawing on Scripture for help, my prayers were shaped by verses such as Proverbs 17:28: "Even fools are thought wise if they keep silent, and discerning if they hold their tongues."

Thankfully, God was faithful to answer my prayers and I have witnessed growth in this area of my life. Nevertheless, my tongue has remained an Achilles heel that I have continued to monitor closely. It is also the reason why, thus far, I have not joined Twitter.

Now I am not opposed to the tool itself, which has tremendous power to encourage believers and build up the church. The reason for my hesitancy has less to do with Twitter and more to do with human nature. The instantaneous broadcasting of spontaneous thoughts presents even the most diligent Christians with risk. Several months ago John Piper posted the tweet heard round the world, bidding farewell to Rob Bell and launching a flood of controversy. More recently, a minor Twitter kerfuffle developed between two prominent Christian authors that drew responses from their Twitter followers, including Her.meneutics. Our own re-tweeting drew subsequent ...

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