St Patrick arrived at the hill of Slane, at the opposite extremity of the valley from Tara, on Easter Eve, in that year the feast of the Annunciation, and on the summit of the hill kindled the Paschal fire.
The druids at once raised their voice. "O King", (they said) "live for ever; this fire, which has been lighted in defiance of the royal edict, will blaze for ever in this land unless it be this very night extinguished." By order of the king and the agency of the druids, repeated attempts were made to extinguish the blessed fire and to punish with death the intruder who had disobeyed the royal command.
But the fire was not extinguished and Patrick shielded by the Divine power came unscathed from their snares and assaults. On Easter Day the missionary band having at their head the youth Benignus bearing aloft a copy of the Gospels, and followed by St Patrick who with mitre and crozier was arrayed in full episcopal attire, proceeded in processional order to Tara...
On that bright Easter Day, the triumph the Triune God i Hibernia was complete. The Ard-Righ granted permission to Patrick to preach the Faith throughout the length and breadth of Erin, and the druidical prophecy like the words of Balaam of old were fulfilled: the sacred fire now kindled by the saint would never be extinguished.
The beautiful prayer of St Patrick, popularly known as "St Patrick's Breast-Plate", is supposed to have been composed by him in preparation for this victory over Paganism. The following is a literal translation from the old Irish text:
I bind to myself today The strong virtue of the Invocation of the Trinity: I believe the Trinity in the Unity The Creator of the Universe.
I bind to myself today The virtue of the Incarnation of Christ with His Baptism, The virtue of His crucifixion with His burial, The virtue of His Resurrection with His Ascension, The virtue of His coming on the Judgement Day.
I bind to myself today The virtue of the love of seraphim, In the obedience of angels, In the hope of resurrection unto reward, In prayers of Patriarchs, In predictions of Prophets, In preaching of Apostles, In faith of Confessors, In purity of holy Virgins, In deeds of righteous men.
I bind to myself today The power of Heaven, The light of the sun, The brightness of the moon, The splendour of fire, The flashing of lightning, The swiftness of wind, The depth of sea, The stability of earth, The compactness of rocks.
I bind to myself today God's Power to guide me, God's Might to uphold me, God's Wisdom to teach me, God's Eye to watch over me, God's Ear to hear me, God's Word to give me speech, God's Hand to guide me, God's Way to lie before me, God's Shield to shelter me, God's Host to secure me, Against the snares of demons, Against the seductions of vices.