Bible Commentaries
Isaiah 40

Verse 4

Isa 40:4

"Every valley shall be exalted, and every mountain and hill shall be made low—and the crooked shall be made straight, and the rough places plain." Isa 40:4

If in your road heavenward, no valley ever sank before you; if no mountain and hill ever rose up in sight; if you encountered no crooked path through the dense woods; and no rough places, with many a rolling stone and many a thorny briar in the tangled forest, it would not seem that you were treading the way which the saints of God have ever trod, nor would it appear as if you needed special help from the sanctuary, or any peculiar power to be put forth for your help and deliverance. But being in this path, and that by God’s own appointment, and finding right before your eyes valleys of deep depression which you cannot raise up; mountains and hills of difficulty that you cannot lay low; crooked things which you cannot straighten; and rough places which you cannot make smooth; you are compelled, from felt necessity, to look for help from above.

These perplexing difficulties, then, are the very things that make yours a case for the gospel, yours a state of mind to which salvation by grace is thoroughly adapted, yours the very condition of soul to which the revelation of the glory of God in the face of Jesus Christ is altogether suitable. So that if you could at the present moment view these trials with spiritual eyes, and feel that they were all appointed by unerring wisdom and eternal love, and were designed for the good of your soul, you would rather bless God that your pathway was so cast in providence and grace that you had now a valley, now a mountain, now a crook, and now a thorn.

And even as regards the present experience of your soul, you would feel that these very difficulties in the road were all productive of so many errands to the throne—that they all called upon you, as with so many speaking voices, to beg of the Lord that he would manifest himself in love to your heart.

We all desire ease; we love a smooth path. We would like to be carried to heaven in a palanquin; to enjoy every comfort that earth can give or heart desire, and then, dying without a pang of body or mind, find ourselves safe in heaven. But that is not God’s way. The word of truth, the sufferings of Christ, and the universal experience of the saints, all testify against the path of ease; all testify for the path of trial; they all proclaim, as with one united voice, "Wide is the gate and broad is the way that leads to destruction,"—and this is the way of ease and of that prosperity which destroys fools (Pr 1:32); but "strait is the gate and narrow is the way which leads unto life,"—and this is the path of suffering and sorrow.

Verse 29

Isa 40:29

"To those who have no might he increases strength." — Isa 40:29

The Lord’s people are often in this state, that they "have no might." All their power seems exhausted, and their strength completely drained away; sin appears to have gotten the mastery over them; and they feel as if they had neither will nor ability to run the race set before them, or persevere in the way of the Lord. Yet, even then, they have strength; for it says, "he increases strength." It does not say, ’he gives, bestows, communicates strength;’ but "he increases strength." How can this be?

We must have power to feel our weakness. God must put forth his power to enable us to fall down into nothingness and helplessness. It therefore says, "he increases strength." As though it would imply, ’Is not the very power to sink down into creature weakness, helplessness, and nothingness, strength?’ It is so in God’s mysterious dealings. And, therefore, "to those who have no might" (in other words, those who are sensible in their own consciences that they have no power at all, who are completely exhausted of nature’s strength and wisdom), to these "he increases strength."

Now the Lord "increases strength" in a very mysterious way. He often drops strength stilly and secretly into the soul. We are not always to expect very great manifestations. This is not the way in which the Lord usually increases strength. His visits to the soul are often better known by their fruits and effects, and by looking back upon them when they are past, than by any immediate impulse. The strength given is more easily felt than the hand seen which communicates it. In this respect it much resembles the new birth, of which the Lord says, "The wind blows where it wills, and you hear the sound thereof, but can not tell whence it comes, and where it goes" (Joh 3:8).

"He gives power to the faint." Isa 40:29

The Lord often gives his people power to take a longing, languishing look at the blood and righteousness of Jesus; to come to the Lord, as "mighty to save," with the same feelings with which Esther went into the presence of the king—"I will go in, and if I perish, I perish." It is with them sometimes as with the four lepers who sat at the entering in of the gate of Samaria—"And they said one to another, Why sit here until we die? If we say, We will enter into the city, then the famine is in the city, and we shall die there—and if we sit still here, we die also. Now therefore come, and let us fall unto the host of the Syrians—if they save us alive, we shall live; and if they kill us, we shall but die" (2Ki 7:3-4). And so the Lord’s people are sometimes brought to this state—"If I perish, I will perish at his footstool." If he gives no answer of mercy, they will still cling to his feet, and beseech him to look upon, and save them.

Now this is "power," real power. Despair would have laid hold upon their soul, if this secret power had not been given to them. Sometimes we learn this by painful experience. Our trials sometimes stun us, and then there is no power to seek or pray. But when power is given, there is a pleading with the Lord, a going out of the heart’s desires after him, and a fulfillment in the soul of the experience described by the prophet, "I will wait upon the Lord, that hides his face from the house of Jacob, and I will look for him."

God gives power also to believe; for it is the work of the blessed Spirit to raise up living faith in the heart. He gives power to hope; for it is only so far as he communicates power, that we can cast forth this anchor of the soul. He gives power to love; for it is only as he gives power, that we feel any measure of affection either to the Lord or to his people. In a word, every spiritual desire, every breath of fervent prayer, every movement of the soul heavenward, every trusting in God’s name, relying on his word, and hanging upon his promises, spring out of power communicated by the Lord to the faint and feeble.

Verse 31

Isa 40:31

"But those who wait upon the Lord shall renew their strength." Isa 40:31

How different the religion of a living soul is from the religion of a dead professor! The religion of a dead professor begins in self, and ends in self; begins in his own wisdom, and ends in his own folly; begins in his own strength, and ends in his own weakness; begins in his own righteousness, and ends in his own damnation! There is in him never any going out of soul after God, no secret dealings with the Lord, no actings of faith upon the divine perfections.

But the child of God, though he is often faint, weary, and exhausted with many difficulties, burdens and sorrows; yet when the Lord does show himself, and renews his strength, he soars aloft, and never ceases to mount up on the wings of faith and love until he penetrates into the very sanctuary of the most High. A living soul never can be satisfied except in living union and communion with the Lord of life and glory. Everything short of that leaves it empty. All the things of time and sense leave a child of God unsatisfied. Nothing but vital union and communion with the Lord of life, to feel his presence, taste his love, enjoy his favor, see his glory—nothing but this will ever satisfy the desires of ransomed and regenerated souls. This the Lord indulges his people with.

"They shall renew their strength." They shall not be always lying groaning on the ground, not always swooning away through the wounds made by sin, not always chained down by the fetters of the world, not always hunted in their souls like a partridge upon the mountains. There shall be a renewal of their strength; and in their renewal, "they shall mount up with wings as eagles; they shall run, and not be weary; and they shall walk, and not faint."

"They shall mount up with wings as eagles." Isa 40:31

It is said of the eagle, that he mounts up towards the sun; and that of all birds, he is the only one which can gaze upon the sun with unshrinking eye. So with faith in the soul. The Lord’s people alone can look by faith upon the "Sun of righteousness," gaze upon a glorious Immanuel at the right hand of the Father, and see a precious Jesus ever interceding for them, and drawing them near to his bosom. And when this blessed Jesus communicates a measure of his love and blood to their consciences, and raises up and draws forth faith in his name, then the soul begins to mount up with these wings like eagles, soaring higher and higher, until it comes into the presence of God; mounting up in higher and higher circles of spiritual flight, until it penetrates into the very sanctuary of Jehovah.

Now, has not your soul thus soared sometimes as upon eagle’s wings? Have there not been those communications of divine life and light, those mountains of faith, those anchorings of hope, those goings forth of love, whereby your soul was enabled to mount up and find delight in Jesus, and felt his name, love, and blood precious? Have you not mounted up too, not only in the exercise of living faith and hope, but also of heavenly affection?

Sometimes we are so fastened down to this earth, this valley of tears, this waste-howling wilderness; so chained down to it, that we are like a bird with a broken wing, and cannot mount. We are swallowed up in the world, forgetting God and godliness. But are there not times and seasons when the soul is delivered from these chains and fetters, when earthly cares drop off from the mind, when our wings are strong, and fresh pinions as it were given, when the world and its temptations, sin and its snares are left behind, and there is a sweet mounting up in the feelings of heavenly affection? This is to "mount up with wings as eagles," and the soaring soul never ceases to mount until it comes into the very presence of the Three-One God of Israel.