This is the Day which the Lord hath made: let us rejoice and be glad in it.
Words dating from a Rededication of the Temple in Jerusalem; and inspired by YHWH to refer to His New Temple, the Lord's Body, which he promised he would raise up in three days after His Enemies had destroyed it.
There is so much in this that it is not surprising that the Western Church considered it to make Hymns, Capitula, Responsoria redundant.
Would this be a good 'ejaculatory prayer' to keep saying during the festa Paschalia: that is, until the First Evensong of Low Sunday? Something to interpolate into the daily Rosary?
A very Happy Easter to all Readers.