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"Isaiah 64:3-5 For since the beginning of the world men have not heard, nor perceived by the ear Not only the things unexpected, undesired, and undeserved, had been done for the Lord's people of old; but there were other things, unheard of and unseen, which God, in his secret counsels, had prepared for them; and for which reason his appearance in his providential dispensations was the more to be desired and entreated. The Apostle Paul has cited this passage in ( 1 Corinthians 2:9 ) and applied it to Gospel times, and to evangelical truths, which are not discoverable by the light of nature; had there not been a revelation from God, the ears of men had never heard them, nor the eyes of men ever seen them: neither hath the eye seen, O God, besides thee; and though there is a revelation made, yet, unless God gives men eyes to see, and ears to hear, divine truths will remain unknown to them; and those who have knowledge of them, it is but imperfect; perfect knowledge of them is reserved to another state. These are mysteries and, though revealed, remain so; the modes of them being unknown, or the manner how they are is inscrutable; such as the mode of each Person's subsisting in the Trinity; and how the two natures, human and divine, are united in the person of Christ. Moreover, under the Old Testament dispensation, these things were not so clearly revealed as now; they were the fellowship of the mystery hid in God, the treasure of Gospel truths hid in the field of the Scriptures; they were wrapped up in the dark figures and shadows of the ceremonial law, and expressed in obscure prophecies; they were kept secret since the beginning of the world, from ages and generations past, and, not so made known, as now, to the holy apostles and prophets; a more full and clear knowledge of them was reserved to Gospel times. This may also include the blessings of grace, more peculiarly prepared and provided for the church of Christ under the Gospel dispensation, especially in the latter part of it, as the promise of the Spirit; more spiritual light and knowledge; peace in abundance, and such as passeth all understanding; and particularly what will be enjoyed in the personal reign of Christ, described in so pompous a manner, ( Revelation 20:1-21:27 ) and it may be applied to the glories of the future state, which are such as the eye of man has never seen, nor his ear heard; and, as the apostle adds, have not entered into the heart of man to conceive of; "

I think that the things that God revealed to his apostles had everything to do with heaven because the death of Jesus was what bridged the gap between us and God; Revelation was given to John, who was an apostle. This did not just include the miraculous birth and life of Jesus in the 1st century but includes all the mysteries stated above. They all are intertwined...what was given in the first century was for them as well as all who followed, culminating in what God has prepared for those who love him. After all Isaish is prophetic and prophecy has near and far fulfillment.