10. Now--Now that Satan has been cast out of heaven. Primarily fulfilled in part at Jesus' resurrection and ascension, when He said (Mt 28:18), "All power [Greek, 'exousia,' 'authority,' as here; see below] is given unto Me in heaven and in earth"; connected with Re 12:5, "Her child was caught up unto God and to His throne." In the ulterior sense, it refers to the eve of Christ's second coming, when Israel is about to be restored as mother-church of Christendom, Satan, who had resisted her restoration on the ground of her unworthiness, having been cast out by the instrumentality of Michael, Israel's angelic prince (see on Re 12:7). Thus this is parallel, and the necessary preliminary to the glorious event similarly expressed, Re 11:15, "The kingdom of this world is become (the very word here, Greek, 'egeneto,' 'is come,' 'hath come to pass') our Lord's and His Christ's," the result of Israel's resuming her place.
      salvation, &c.--Greek, "the salvation (namely, fully, finally, and victoriously accomplished, Heb 9:28; compare Lu 3:6, yet future; hence, not till now do the blessed raise the fullest hallelujah for salvation to the Lamb, Re 7:10; 19:1) the power (Greek, 'dunamis'), and the authority (Greek, 'exousia'; 'legitimate power'; see above) of His Christ."
      accused them before our God day and night--Hence the need that the oppressed Church, God's own elect (like the widow, continually coming, so as even to weary the unjust judge), should cry day and night unto Him.

JFB.