Darby's Synopsis of the New Testament - Revelation 1:8
1:8 come, (e-22) It is not 'about to come,' for the act of the Lord's coming is not immediately before the mind. I will not say there is no allusion to the future awaited exercise of divine power; for in Daniel, not only is the Son of man brought before the Ancient of days, but the Ancient of days comes. In the words 'who is, and was, and is to come,' there is surely reference to the abiding nature of his being. 'Who is to come' seems to me thus to render more truly the sense than any other... read more
Expository Notes of Dr. Thomas Constable - Revelation 1:8
God confirmed the preceding forecast with a solemn affirmation of His eternity and omnipotence. Alpha and omega are the first and last letters of the Greek alphabet and signify here God’s comprehensive control over all things including time. This is probably a merism, a figure of speech in which two extremes represent the whole. John strengthened this point further with present, past, and future references (cf. Revelation 4:8; Revelation 11:17; Hebrews 13:8). He is the originator and terminator... read more