Matthew Henry Commentary Revelation 20:1-3

"And I saw an angel coming down out of heaven, having the key of the abyss and a great chain in his hand. And he laid hold on the dragon, the old serpent, which is the Devil and Satan, and bound him for a thousand years, and cast him into the abyss, and shut [it], and sealed [it] over him, that he should deceive the nations no more, until the thousand years should be finished: after this he must be loosed for a little time." — Revelation 20:1-3 (ASV)

Here is a vision, showing figuratively the restraints imposed on Satan himself. Christ, with Almighty power, will keep the devil from deceiving humankind as he has done until now. He never lacks power and instruments to break the power of Satan. Christ shuts by his power, and seals by his authority. The church will have a time of peace and prosperity, but all her trials are not yet over.