Unfortunately like most Christian holidays the Feast Day of Saint Patrick has been perverted by secular culture. When St. Patrick's Day rolls around people tend to associate heavy drinking, partying, and being very certain to wear green as the true meaning of the day. As with the Easter bunny and Santa Clause, these profane ideas are prevalent and ignore the purely Christian nature of the special occasion. A better testimony to what should be part of the celebration of St. Paddy's Day is best laid out by the man himself. Below in full is "St. Patrick's Lorica", which are words attributed to the patron saint of Ireland and also the lyrics to my favorite hymn, "I Bind Unto Myself Today", which is found in the link proceeding.

I bind unto myself today
The strong Name of the Trinity,
By invocation of the same
The Three in One and One in Three.

I bind this today to me forever
By power of faith, Christ’s incarnation;
His baptism in Jordan river,
His death on Cross for my salvation;
His bursting from the spicèd tomb,
His riding up the heavenly way,
His coming at the day of doom
I bind unto myself today.

I bind unto myself the power
Of the great love of cherubim;
The sweet ‘Well done’ in judgment hour,
The service of the seraphim,
Confessors’ faith, Apostles’ word,
The Patriarchs’ prayers, the prophets’ scrolls,
All good deeds done unto the Lord
And purity of virgin souls.

I bind unto myself today
The virtues of the star lit heaven,
The glorious sun’s life giving ray,
The whiteness of the moon at even,
The flashing of the lightning free,
The whirling wind’s tempestuous shocks,
The stable earth, the deep salt sea
Around the old eternal rocks.

I bind unto myself today
The power of God to hold and lead,
His eye to watch, His might to stay,
His ear to hearken to my need.
The wisdom of my God to teach,
His hand to guide, His shield to ward;
The word of God to give me speech,
His heavenly host to be my guard.

Against the demon snares of sin,
The vice that gives temptation force,
The natural lusts that war within,
The hostile men that mar my course;
Or few or many, far or nigh,
In every place and in all hours,
Against their fierce hostility
I bind to me these holy powers.

Against all Satan’s spells and wiles,
Against false words of heresy,
Against the knowledge that defiles,
Against the heart’s idolatry,
Against the wizard’s evil craft,
Against the death wound and the burning,
The choking wave, the poisoned shaft,
Protect me, Christ, till Thy returning.

I bind unto myself the Name,
The strong Name of the Trinity,
By invocation of the same,
The Three in One and One in Three.
By Whom all nature hath creation,
Eternal Father, Spirit, Word:
Praise to the Lord of my salvation,
Salvation is of Christ the Lord.

Source:

http://www.cyberhymnal.org/htm/s/t/stpatric.htm, accessed March 16th, AD 2008.