Now, however, that the devil, that tyrant against the whole world, is slain, we do not approach a temporal feast, my beloved, but an eternal and heavenly. Not in shadows do we shew it forth, but we come to it in truth. For they being filled with the flesh of a dumb lamb, accomplished the feast, and having anointed their door-posts with the blood, implored aid against the destroyer. But now we, eating of the Word of the Father, and having the lintels of our hearts sealed with the blood of the New Testament (Mat 26:28), acknowledge the grace given us from the Saviour, who said, ‘Behold, I have given unto you to tread upon serpents and scorpions, and over all the power of the enemy’ (Luke 10:19). For no more does death reign; but instead of death henceforth is life, since our Lord said, ‘I am the life’ (Jn 14:6). so that everything is filled with joy and gladness; as it is written, ‘The Lord reigneth, let the earth rejoice.’ For when death reigned, ‘sitting down by the rivers of Babylon, we wept’ (Ps 97:1, 137:1), and mourned, because we felt the bitterness of captivity; but now that death and the kingdom of the devil is abolished, everything is entirely filled with joy and gladness. And God is no longer known only in Judæa, but in all the earth, ‘their voice hath gone forth, and the knowledge of Him hath filled all the earth’ (Ps 26:1, 19:4).
What follows, my beloved, is obvious; that we should approach such a feast, not with filthy raiment, but having clothed our minds with pure garments. For we need in this to put on our Lord Jesus (cf Rom 13:14), that we may be able to celebrate the feast with Him. Now we are clothed with Him when we love virtue, and are enemies to wickedness, when we exercise ourselves in temperance and mortify lasciviousness, when we love righteousness before iniquity, when we honour sufficiency, and have strength of mind, when we do not forget the poor, but open our doors to all men, when we assist humble-mindedness, but hate pride.
[St. Athanasius of Alexandria, Festal Letter IV, 332 AD]