Quasi modo géniti infántes, allelúja: rationabiles, sine dolo lac concupíscite, allelúja, allelúja allelúja.
Vs. Exsultáte Deo, adjutóri nostro: jubiláte Deo Jacob.
Vs. Glória Patri, et Fílio, et Spirítui Sancto. Sicut erat in princípio, et nunc, et semper, et in saécula sæculórum. Amen.
As newborn babes, alleluia, long for pure spiritual milk, alleluia, alleluia, alleluia.
Vs. Rejoice in honour of God our helper; shout for joy to the God of Jacob.
Vs. Glory be to the Father, and to the Son, and to the Holy Spirit. As it was in the beginning, is now, and ever shall be, world without end. Amen.
Many thanks to Corpus Christi Watershed for video and text!
As to the tradition of the Church as related to the Second Sunday in the Octave of Easter prior to being dubbed Divine Mercy Sunday by John Paul II in 2000, I highly recommend this posting by Fr. Z at WDTPRS.