And Thomas, beholding and examining carefully the hands and side of the Master, cried out with faith, "My Lord and my God." Thus he clearly proclaimed the two natures - human and divine - of the God-man (Luke 24:36-49; John 20:19-29).
This day is called Antipascha (meaning "in the stead of Pascha," not "in opposition to Pascha") because with this day, the first Sunday after Pascha, the Church consecrates every Sunday of the year to the commemoration of Pascha, that is, the Resurrection.
Apolytikion in the Grave Tone
Kontakion in the Plagal of the Fourth Tone
SAINT OR FEAST POSTED THIS DATE 2010(with 2009's link here also and further, 2008's, even 2007!