The apostle having described the persons to whom he wrote, and declared to them the excellent advantages they were under, goes on to show them what warrant he had for what he had delivered; and because they were Jews, and had a profound veneration for the Old Testament, he produces the authority of the prophets to convince them that the doctrine of salvation by faith in Jesus Christ was no new doctrine, but the same which the old prophets did enquire and search diligently into. Note, I. Who made this diligent search - the prophets, who were persons inspired by God either to do or to say things extraordinary, above the reach of their own studies and abilities, as foretelling things to come, and revealing the will of God, by the direction of the Holy Spirit. II. The object of their search, which was salvation, and the grace of God which should come unto you; the general salvation of men of all nations by Jesus Christ, and more especially the salvation afforded to the Jews, the grace that should come to them from him who was not sent but to the lost sheep of the house of Israel. They foresaw glorious times of light, grace, and comfort, coming upon the church, which made the prophets and righteous men desire to see and hear the things which came to pass in the days of the gospel. III. The manner of their enquiry: they enquired and searched diligently. The words are strong and emphatic, alluding to miners, who dig to the bottom, and break through not only the earth, but the rock, to come to the ore; so these holy prophets had an earnest desire to know, and were proportionably diligent in their enquiries after the grace of God, which was to be revealed in the days of the Messiah: their being inspired did not make their industrious search needless; for, notwithstanding their extraordinary assistance from God, they were obliged to make use of all the ordinary methods of improvement in wisdom and knowledge. Daniel was a man greatly beloved and inspired, yet he understood by books and study the computations of time, Dan 9:2. Even their own revelation required their study, meditation, and prayer; for many prophecies had a double meaning: in their first intention they aimed at some person or event near at hand, but their ultimate design was to describe the person, sufferings, or kingdom of Christ. Observe, 1. The doctrine of man's salvation by Jesus Christ has been the study and admiration of the greatest and wisest of men; the nobleness of the subject, and their own concern in it, have engaged them, with most accurate attention and seriousness to search into it. 2. A good man is much affected and pleased with the grace and mercy of God to others, as well as to himself. The prophets were highly delighted with the prospects of mercy to be shown both to Jews and Gentiles at the coming of Christ. 3. Those who would be acquainted with this great salvation, and the grace that shines therein, must enquire and search diligently into it: if it was necessary for an inspired prophet to do so, much more for persons so weak and injudicious as we are. 4. The grace that came by the gospel excels all that was before it; the gospel dispensation is more glorious, evident, intelligible, extensive, and effectual, than any dispensation that ever did precede it. IV. The particular matters which the ancient prophets chiefly searched into, which are expressed in Pe1 1:11. Jesus Christ was the main subject of their studies; and, in relation to him, they were most inquisitive into, 1. His humiliation and death, and the glorious consequences of it: The sufferings of Christ, and the glories that should follow. This enquiry would lead them into a view of the whole gospel, the sum whereof is this, that Christ Jesus was delivered for our offences and raised again for our justification. 2. The time, and the manner of the times, wherein the Messiah was to appear. Undoubtedly these holy prophets earnestly desired to see the days of the Son of man; and therefore, next to the thing itself, their minds were set upon the time of its accomplishment, so far as the Spirit of Christ, which was in them, had signified any thing towards that purpose. The nature of the times was also under their strict consideration, whether they would be quiet or troublesome times, times of peace or times of war. Learn, (1.) Jesus Christ had a being before his incarnation; for his Spirit did then exist in the prophets, and therefore he whose that Spirit then was must be in being also. (2.) The doctrine of the Trinity was not wholly unknown to the faithful in the Old Testament. The prophets knew that they were inspired by a Spirit that was in them; this Spirit they knew to be the Spirit of Christ, and consequently distinct from Christ himself: here is a plurality of persons, and from other parts of the Old Testament a Trinity may be collected. (3.) The works here ascribed to the Holy Ghost prove him to be God. He did signify, discover, and manifest to the prophets, many hundred years beforehand, the sufferings of Christ, with a multitude of particular circumstances attending them; and he did also testify, or give proof and evidence beforehand, of the certainty of that event, by inspiring the prophets to reveal it, to work miracles in confirmation of it, and by enabling the faithful to believe it. These works prove the Spirit of Christ to be God, since he is possessed of almighty power and infinite knowledge. (4.) From the example of Christ Jesus learn to expect a time of services and sufferings before you are received to glory. It was so with him, and the disciple is not above his Lord. The suffering time is but short, but the glory is everlasting; let the suffering season be ever so sharp and severe, it shall not hinder, but work for us a far more exceeding and eternal weight of glory. V. The success with which their enquiries were crowned. Their holy endeavours to inform themselves were not slighted, for God gave them a satisfactory revelation to quiet and comfort their minds. They were informed that these things should not come to pass in their time, but yet all was firm and certain, and should come to pass in the times of the apostles: Not unto themselves, but to us; and we must report them, under the infallible direction of the Holy Ghost, to all the world. Which things the angels, etc. You have here three sorts of students, or enquirers into the great affair of man's salvation by Jesus Christ: - 1. The prophets, who searched diligently into it. 2. The apostles, who consulted all the prophecies, and were witnesses of the accomplishment of them, and so reported what they knew to others in the preaching of the gospel. 3. The angels, who most attentively pry into these matters. Learn, (1.) A diligent endeavour after the knowledge of Christ and our duty will certainly be answered with good success. The prophets are answered with a revelation. Daniel studies, and receives information: the Bereans search the scriptures, and are confirmed. (2.) The holiest and best of men sometimes have their lawful and pious requests denied. It was both lawful and pious for these prophets to desire to know more than they were permitted to know about the time of the appearance of Christ in the world, but they were denied. It is lawful and pious for good parents to pray for their wicked children, for the poor to pray against poverty, for a good man to pray against death; yet, in these honest requests, they often are denied. God is pleased to answer our necessities rather than our requests. (3.) It is the honour and practice of a Christian to be useful to others, in many cases, rather than to himself. The prophets ministered to others, not unto themselves. None of us liveth to himself, Rom 14:7. Nothing is more contrary to man's nature nor to Christian principles than for a man to make himself his own end, and live to himself. (4.) The revelations of God to his church, though gradual, and given by parcels, are all perfectly consistent; the doctrine of the prophets and that of the apostles exactly agree, as coming from the same Spirit of God. (5.) The efficacy of the evangelical ministry depends upon the Holy Ghost sent down from heaven. The gospel is the ministration of the Spirit; the success of it depends upon his operation and blessing. (6.) The mysteries of the gospel, and the methods of man's salvation, are so glorious that the blessed angels earnestly desire to look into them; they are curious, accurate, and industrious in prying into them; they consider the whole scheme of man's redemption with deep attention and admiration, particularly the points the apostle had been discoursing of: Which things the angels desire to stoop down and look into, as the cherubim did continually towards the mercy-seat.