from his Explanatory Notes:
It is scarce possible for any that either love or fear God not to feel their hearts extremely affected in seriously reading either the beginning or the latter part of the Revelation. These, it is evident, we cannot consider too much; but the intermediate parts I did not study at all for many years; as utterly despairing of understanding them, after the fruitless attempts of so many wise and good men: and perhaps I should have lived and died in this sentiment, had I not seen the works of the great Bengelius. But these revived my hopes of understanding even the prophecies of this book; at least many of them in some good degree: for perhaps some will not be opened but in eternity. Let us, however, bless God for the measure of light we may enjoy, and improve it to his glory.
...I by no means pretend to understand or explain all that is contained in this mysterious book. I only offer what help I can to the serious inquirer, and shall rejoice if any be moved thereby more carefully to read and more deeply to consider the words of this prophecy. Blessed is he that does this with a single eye. His labour shall not be in vain.