Then he opened their understanding. As the Lord had formerly discharged the office of Teacher, with little or no improvement on the part of the disciples, he now begins to teach them inwardly by his Spirit; for words are icily wasted on the air, until the minds are enlightened by the gift of understanding. It is true, indeed, that the word of God is like a lamp, (Psalm 119:105;) but it shines in darkness and amidst the blind, until the inward light is given by the Lord, to whom it peculiarly belongs to enlighten the blind, (Psalm 146:8.) And hence it is evident how great is the corruption of our nature, since the light of life exhibited to us in the heavenly oracles is of no avail to us. Now if we do not perceive by the understanding what is right, how would the will be sufficient for yielding obedience? We ought, therefore, to acknowledge that we come short in every respect, so that the heavenly doctrine proves to be useful and efficacious to us, only so far as the Spirit both forms our minds to understand it, and our hearts to submit to its yoke; and, therefore, that in order to our being properly qualified for becoming his disciples, we must lay aside all confidence in our own abilities, and seek light from heaven; and, abandoning the foolish opinion of free-will, must give ourselves up to be governed by God. Nor is it without reason that Paul bids men become fools, that they may be wise to God, (1-Corinthians 3:18;) for no darkness is more dangerous for quenching the light of the Spirit than reliance on our own sagacity. That they might understand the Scriptures. Let the reader next observe, that the disciples had not the eyes of their mind opened, so as to comprehend the mysteries of God without any assistance, but so far as they are contained in the Scriptures; and thus was fulfilled what is said, (Psalm 119:18,) Enlighten mine eyes, that I may behold the wonders of thy law. For God does not bestow the Spirit on his people, in order to set aside the use of his word, but rather to render it fruitful. It is highly improper, therefore, in fanatics, under the pretense of revelations, to take upon themselves the liberty of despising the Scriptures; for what we now read in reference to the apostles is daily accomplished by Christ in all his people, namely, that by his Spirit he guides us to understand the Scriptures, and does not hurry us away into the idle raptures of enthusiasm. But it may be asked, Why did Christ choose to lose his labor, during the entire period of three years, in teaching them, rather than to open their understandings from the very outset? I reply, first, though the fruit of his labor did not immediately appear, still it was not useless; for when the new light was given to them, they likewise perceived the advantage of the former period. For I regard these words as meaning, not only that he opened their understandings, that, in future they might be ready to receive instruction, if any thing were stated to them, but that they might call to remembrance his doctrine, which they had formerly heard without any advantage. Next, let us learn that this ignorance, which lasted during three years, was of great use for informing them that from no other source than from the heavenly light did they obtain their new discernment. Besides, by this fact Christ gave an undoubted proof of his Divinity; for he not only was the minister of the outward voice, which sounded in their ears, but by his hidden power he penetrated into their minds, and thus showed that what, Paul tells us, does not belong to the teachers of the Church is the prerogative of Him alone, (1-Corinthians 3:7.) Yet it ought to be observed, that the apostles were not so destitute of the light of understanding as not to hold certain elementary principles; but as it was only a slight taste, it is reckoned to be a commencement of true understanding when the veil is removed, and they behold Christ in the Law and the Prophets.

Opened he their understanding - Enabled them fully to comprehend the meaning of the prophecies which foretold his death and resurrection. They had seen him die, they now saw him risen. Their prejudices were now, by his instructions, and by the facts which they could no longer call in question, removed, and they no longer doubted that he was the Messiah, and that all the "facts" in the case which had before confounded them could be easily accounted for. Hence, we may learn:
1. That "facts," or the farther disclosure of truth, will yet remove the "mysteries" that we now see in religion.
2. That our prejudices and our preconceived opinions are one cause of our seeing so many mysteries in the Bible. If a man is willing to take the plain declarations of the Bible, he will commonly be little perplexed with mysteries.
3. That God only can open the mind so as fully to comprehend the Scriptures. He only can overcome our prejudices, open our hearts, and dispose us to receive the ingrafted word with meekness, and with the simplicity of a child. See Acts 16:14; James 1:21; Mark 10:15.
4. The design of God's opening the understanding is that we may be acquainted with the Scriptures. It is not that we may be made wise above what is written, but that we may submit ourselves wholly to the Word of God.

Then opened he their understanding - Διηνοιξεν, He fully opened. They had a measure of light before, so that they discerned the Scriptures to be the true word of God, and to speak of the Messiah; but they had not light sufficient to enable them to apply these Scriptures to their Lord and Master; but now, by the influence of Christ, they see, not only, the prophecies which pointed out the Messiah, but also the Messiah who was pointed out by these prophecies. The book of God may be received in general as a Divine revelation, but the proper meaning, reference, and application of the Scriptures can only be discerned by the light of Christ. Even the very plain word of God is a dead letter to those who are not enlightened by the grace of Christ; and why? because this word speaks of spiritual and heavenly things; and the carnal mind of man cannot discern them. They who receive not this inward teaching continue dark and dead while they live.

Then opened he their understanding,.... He not only opened their hearts, to attend to what he said, and the proofs he gave of his resurrection from the dead in a true body; but he removed the veil from the eyes of their minds, and gave them an understanding of the sacred writings, respecting this matter:
that they might understand the Scriptures; concerning his sufferings, death, and resurrection, which they were very ignorant of before, and which were as a sealed book unto them, John 20:9 though they had been from their infancy brought up to the reading of the Scriptures, and had had the advantage of Christ's ministry for some years; which shows the necessity of the special illumination of the Spirit, and the influence of his grace to remove the darkness of the mind, and give the true sense of the sacred writings.

Then opened he, &c.--a statement of unspeakable value; expressing, on the one hand, Christ's immediate access to the human spirit and absolute power over it, to the adjustment of its vision, and permanent rectification for spiritual discernment (than which it is impossible to conceive a stronger evidence of His proper divinity); and, on the other hand, making it certain that the manner of interpreting the ld Testament which the apostles afterwards employed (see the Acts and Epistles), has the direct sanction of Christ Himself.

Then opened he their understanding, to understand the Scriptures - He had explained them before to the two as they went to Emmaus. But still they Understood them not, till he took off the veil from their hearts, by the illumination of his Spirit.