When Gabriel told Zechariah his wife would bear him a son, he had a question. When Gabriel told Mary she would give birth to Jesus, she had a question as well. But Zechariah got in trouble with Gabriel, and was struck dumb for nine months, whereas Mary was blessed.
Was Gabriel having a bad day when he went to Zechariah? Or what was the difference? Meditate on Luke 1 and let me know your thoughts!