I became accustomed to the twinging pain after a while. At first, my sensitive fingertips were sore and screaming for relief when I began picking on the guitar over thirteen years ago. Pressing down on the nickel strings, bending them for that twang sound, and sliding from fret to fret to look like Stevie Ray Vaughn made my cushy fingertips calloused. When it was all new, it stung so badly that playing the air guitar seemed preferable. But over time, calluses formed on my fingers, melting away all sensitivity to fingertip pain for good.
A callus on the fingertip may be helpful, but a callus growing on the heart and mind is eternally hazardous. For this reason, the word of God sounds the alarm on the destructiveness of callousness, which refers to a deadened sensitivity to sin. According to Paul, the minds of unbelievers are callous—insensitive to iniquity, torpid to transgression, and unresponsive to ungodliness (Eph. 4:19). In fact, the conscience of an unsaved person can even be cauterized or “seared” so that it is numb to evil and its everlasting repercussions (1 Tim. 4:2). And it is possible for even Christians to become calloused to crookedness, indifferent to impiety, lethargic toward lawlessness, and “dull of hearing” (Matt. 13:15; Heb. 5:11).
Calluses form gradually, too. Mine did not grow overnight, but through practicing and playing the guitar for over a decade—and likewise, our sensitivity to evil gradually lessens the more we play with it. We begin by accepting our sin, and telling ourselves, “Just sinning this once won’t hurt.” Then we progress to advocating our sin, thinking, “Well, my sin isn’t as bad as everyone else’s!” And soon enough, we move on to approval of our sin, saying, “This sin isn’t too bad after all.” And once we get to the point where sin no longer makes us blush (Jer. 6:15), we have become callous.
How can you know if you have become callous? Think about your reactions to sin in your life and in the world. Do you gasp when you hear about the infanticide of abortion taking place in our country? Do profanities and graphic scenes on television make you sick to your spiritual stomach to the point where you turn it off? And when you fall into temptation, are you overcome with godly sorrow, or do you make excuses for it?
Thankfully, spiritual callousness can be cured by the salve of Christ’s healing grace and through repentance and renunciation of sins that cause calluses (Rev. 3:19). If calluses have formed on your heart and mind, let Jesus apply His balm to make you sensitive to sin again, and instead of repeating the evils that make you indifferent, repent of them. Moreover, deepen your knowledge of what is right from the Scripture. Knowing the word of God is the only way to know our wretchedness (Romans 7:13, 24). Have you become calloused?
Bible Gleanings is a widely-read weekend devotional column, written for the Murray Ledger & Times in Calloway County, Kentucky.

Brandon is the founder and main contributor to Brandon’s Desk, the blog with biblical resources from his ministry. He pastored the family of believers at Locust Grove Baptist Church in Murray, Kentucky for six years. He and his wife Dakota live there with their three dogs, Susie (Jack Russell), Aries (English Shepherd), and Dot (Bluetick Beagle).
For more devotional entries like this, check out Brandon’s latest book, Bible Gleanings Volume II, which features 100 daily devotionals gleaned from God’s word: