Revelation 1:1

Here we have, I. What we may call the pedigree of this book. 1. It is the revelation of Jesus Christ. The whole Bible is so; for all revelation comes through Christ and all centres in him; and especially in these last days God has spoken to us by his Son, and concerning his Son. Christ, as the king of his church, has been pleased thus far to let his church know by what rules and methods he will proceed in his government; and, as the prophet of the church, he has made known to us the things that shall be hereafter. 2. It is a revelation which God gave unto Christ. Though Christ is himself God, and as such has light and life in himself, yet, as he sustains the office of Mediator between God and man, he receives his instructions from the Father. The human nature of Christ, though endowed with the greatest sagacity, judgment, and penetration, could not, in a way of reason, discover these great events, which not being produced by natural causes, but wholly depending upon the will of God, could be the object only of divine prescience, and must come to a created mind only by revelation. Our Lord Jesus is the great trustee of divine revelation; it is to him that we owe the knowledge we have of what we are to expect from God and what he expects from us. 3. This revelation Christ sent and signified by his angel.

— Matthew Henry's Concise Commentary (public domain)