Bede the Venerable

And mark, that as when our Lord was baptized in Jordan, so also when He was glorified on the Mount, the mystery of the whole Trinity is declared; for His glory which we confess at baptism, we shall see at the resurrection. Nor in vain does the Holy Spirit appear here in the cloud, there in the form of a dove, seeing that he who now preserves with a simple heart the faith which he receives, shall then in the light of open vision look upon those things which he believed.