{I am the Alpha and the Omega} (Eg(9320)to Alpha kai to O).
Applied to God in  1:8  21:6 , and here alone to Christ, crowning
proof in this book of Christ's deity. So in  21:6  God is termed,
as Christ is here, h(8820)arch(8820)kai to telos (the beginning and the
end), while ho pr(9374)os kai ho eschatos (the first and the last)
is applied only to Christ ( 1:17  2:8 ). Solemn assurance is thus
given that Christ is qualified to be the Judge of verse  12  (cf.
 Mt 25:31-46 ). In  Heb 12:2  Jesus is the arch(8867)os kai
telei(9374)(8873) t(8873) piste(9373) (the author and finisher of faith). Christ
was the Creator of the universe for the Father. So now he is the
Consummation of redemption.