That is to say, by continually telling them what they will continually refuse to hear because it does not suit the habit of their lives, he would be setting in motion the action that would bring these results. The ears that won’t hear by and by can’t hear. The heart that will not love and obey gets into a state of fatty degeneration. The valves that refuse to move in loving obedience will get too heavy with fat to move at all. The fat clogs the hinges. There is the touch of a soft irony in the form of the message. As though Isaiah’s talking would affect their ears, whereas it is their refusal to hear that stupefies the hearing organ. In faithfulness God insists on telling them the truth even though He knows that their refusal to do will make things worse. But then God is never held back from good by the possible bad that may work out of it.
When Jesus came, the Jews, to whom His messages to the world were directly spoken, were in almost the last stages of that sort of thing. So Jesus, with the fine faithfulness of love blending with the keenest tact, spoke in language veiled by parable to overcome the intense prejudice against plainly spoken truth. They were so set against what He had to tell that the only way to get anything into them at all was so to veil its form as to befool them into thinking it truer. Toward the close, His keenness, for which they were no match, joining with the growing keenness of their hate, made them see at once that the sharp edge of some of those last parables was turned toward themselves.
In explaining to His puzzled disciples about this form of teaching, with a sad irony that reveals both His heart’s yearning and His mental keenness, He uses more than once with variations this famous bit from Isaiah. He makes the truth stand out more sharply by stating the opposite of what He desires, making the contrast between His words and His known desires so strong as not only to make plain the meaning intended, but to give it a sharper emphasis.
The result that began with ears and eyes quickly affected the tongue. That is nature’s path. The inner road from ear and eye is straight to the tongue. The tongue is the index of man’s whole being. While through ear and eye he receives all that ever gets in, through the tongue his whole being is revealed. Of course his personality reveals itself very much otherwise. In the carriage of the body. Strikingly so in the look of the eye. The body itself, especially the face, becomes in time the mould of the spirit within. Yet the tongue—what is said, how it is said, what is not said, the tone of voice—the tongue is the index of the spirit.
There is no stronger indication of mastery over one’s powers than in control of the tongue. When God would break up man’s first great ambitious scheme of a self-centred monopoly on the Shinar plains, He simply touched his tongue. The first evidence of God’s touch in the re-making of man on that memorable Pentecost day was upon his tongue.