Luke 1 includes one of the most revealing cases of the seriousness of unbelief. You remember the story of godly Zacharias, the father of John the Baptist. Zacharias was a devoted priest who suffered because of a single episode of unbelief. His story illustrates just how seriously God takes this sin.
Scripture says Zacharias was “righteous before God, walking in all the commandments and ordinances of the Lord blameless” (Luke 1:6). Here was a pious man who wore the robes of his respected position. He ministered before the altar of incense, which represented prayer and supplication, acts of pure worship. In short, Zacharias was faithful and obedient, a servant who longed for the Messiah’s coming.
One day as Zacharias was ministering, God sent the angel Gabriel to tell him his wife would have a son. Gabriel said the son’s birth would be a cause for rejoicing for many in Israel, and he gave Zacharias detailed instructions on how to raise the boy. Yet, as the angel spoke, Zacharias trembled in fear. Suddenly, this devout man’s mind was filled with doubt, and he gave in to terrible unbelief. He asked the angel, “How do I know you’re telling me the truth? After all, my wife and I are old” (see Luke 1:18).
God didn’t take kindly to Zacharias’ doubt, and he passed this sentence on the priest: “Behold, thou shalt be dumb, and not able to speak, until the day that these things shall be performed, because thou believest not my words” (Luke 1:20, my italics).
What does this episode tell us? It says unbelief shuts our ears to God, even when He is speaking clearly to us. It shuts us off from fresh revelation and it keeps us from intimate communion with the Lord. Suddenly, because we no longer hear from God, we have nothing to preach or testify. It doesn’t matter how faithful or diligent we may be; like Zacharias, we bring on ourselves a paralysis of both our ears and tongue.