'The first and the last' signifies that the Lord is the only God.

(Mga Sanggunian: Apocalypse Revealed 92)

92. "'These things says the First and the Last.'" This symbolizes the Lord, that He alone is God.

The Lord calls Himself the First and the Last, the Beginning and the End, and the Alpha and the Omega, also He who is and who was and who is to come. See chapter 1, verses 4, 8, 11, 17. And for the symbolic meaning of these, see nos. 13, 29, 30, 31, 38, 57 above, where it is apparent that they mean as well that He alone is God.