The master holds an instrument in His hands... He has a song to play, a perfect song. He chooses just the instrument for this song he has written, an instrument he will use to play the song through.
If the instrument he chooses is not in tune to His song, the quality of the song will be greatly affected. Consider a guitar missing a string, or a violin with strings that have not been tuned... consider a piano with broken hammers, or a clarinet without a reed... consider how different the song will sound from what’s intended!