The second part of the chapter begins with an urgent call to repentance, based upon the difference between God's ways and man's, and on the certainty that the divine promises will be fulfilled. The summons in Isaiah 55:6-7 is first couched in most general terms, which are then more closely defined. To seek the Lord' is to direct conduct and heart to obtain possession of God as one's own. Of that seeking, the chief element is calling upon Him; since such is His desire to be found of us that it only needs our asking in order to receive. As surely as the mother hears her child's cry, so surely does He catch the faintest voice addressed to Him. But, men being what they are, a change of ways and of their root in thoughts is indispensable. Seeking which is not accompanied by forsaking self and an evil past is no genuine seeking, and will end in no finding. But this forsaking is only one side of true repentance; the other is return to God, as is expressed in the New Testament word for it, which implies a change of mind, purpose, and conduct. The faces which were turned earthward and averted from God are to be turned God-ward and diverted from earth. Whosoever thus seeks may be confident of finding and of abundant pardon. The belief in God's loving forgivingness is the strongest motive to repentance, and the most melting argument to listen to the call to seek Him. But there is another motive of a more awful kind; namely, the consideration that the period of mercy is limited, and that a time may come, and that soon, when God no longer may be found nor is near.
The need for such a radical change in conduct and mind is further enforced, in Isaiah 55:8-9, by the emphatic statement of present discord between the exiled Israel and God. Mark that the deepest seat of the discord is first dealt with, and then the manifestation of it in active life. mark also that the order of comparison is inverted in the two successive clauses in Isaiah 55:8. God's thoughts have not entered into Israel's mind and become theirs. The thinkings not being regulated according to God's truth, nor the desires and sentiments brought into accord with His will and mind, a contrariety of ways must follow, and the paths which men choose for themselves cannot run parallel with God's, nor be pleasing to Him. Therefore the stringent urgency of the call to forsake the crooked, wandering ways in which we live,' and to come back to the path of righteousness which is traced by God for our feet.
But divergence which necessitates repentance is not the only relation between our ways and God's. There is elevation, transcendency, like that of the eternal heavens, high, boundless, the home of light, the storehouse of beneficent influences which fertilise. If we think of the dreary, flat plains where the exiles were, and the magnificent sweep of the sky over them, we shall feel the beauty of the figure. If My thoughts are not your thoughts was all that was to be said, repentance would be of little use, and there would be little to encourage to it; but if God's thoughts of love and ways of blessing arch themselves above our low lives as the sky bends, pitying and bestowing, above squalor, barrenness, and darkness, then penitence is not in vain, and the low earth may be visited with gifts from the highest heaven.
The certainty that such gifts will be bestowed is the last thought of this magnificent summons. The prophet dilates on that assurance to the end of the chapter. He seems to catch fire, as it were, from the introduction of that grand figure of the lofty heavens domed above the flat earth. In effect, what he says is: They are high and inaccessible, but think what pours down from them, and how all fertility depends on their gifts of rain and snow, and how the moisture which they drop is turned into seed to the sower, and bread to the eater.' Thinking of that continuous benefaction and miracle, we should see in it a symbol of the better gifts from the higher heavens. So does God's word come down from His throne. So does it turn barrenness into nodding harvest. So does it quicken undreamed-of powers of fruitfulness in human nature and among the forces of the world. So does it supply nourishment for hungry souls, and germs which shall bear fruit in coming years. No complicated machinery nor the most careful culture can work what the gentle dropping rain effects. There is mightier force in it than in many thunder-clouds. The gospel does with ease and in silence what nothing else can do. It makes barren souls fruitful in all good works, and in all happiness worthy of men. Therefore the summons to drink of the springing fountain and to turn from evil ways and thoughts is recommended by the assurance that God's word is faithful, and all His promises firm.
The final verses (Isaiah 55:12-13) give the glowing picture of the return from exile amid the jubilation of a transformed world, as the strongest motive to the obedient hearkening to God's voice, to which the chapter has summoned, and as the great instance of God's keeping His word.
The flight from Egypt was in haste (Deut. 16:3); but this shall be a triumphal exodus, without conflict or alarms. All nature shall participate in the joy. Mountains and hills shall raise the shrill note of rejoicing, and the trees wave their branches, as if clapping hands in delight. This is more than mere poetic rhetoric. A redeemed humanity implies a glorified world, Nature has been involved in the consequences of sin, and will share in the results of redemption, and have some humble reflected light from the liberty of the glory of the sons of God.'
The fulfilment of this final promise is not yet. All earlier returns of the exiled Israel from the Babylon of their bondage to God and the city of God, such as the historical one which the prophet foretold, and the spiritual one which is repeated age by age in the history of the Christian Church and of single penitent souls, point on to that last triumphant day when the ransomed of the Lord shall return,' and the world be transfigured to match the glory that they inherit. That fair world without poison or offence, and the nations of the saved who inhabit its peaceful spaces, shall be, in the. fullest stretch of the words, to the Lord for a name, and for an everlasting sign that shall not be cut off.' The redemption of man and his establishing amid the felicities of a state correspondent to His God-given glory shall be to all eternity and to all possible creations the highest evidence of what God is, and His token to all beings.
