Not many facts are known about the life of St. Patrick. We know that he was born around 415 AD, and was a Roman Briton. When he was about 16, while he was tending his sheep some Irish raiders captured him and made him a slave. He eventually was able to escape and return to Britain. There he heard the call to return and bring Christianity to Ireland. He was ordained a priest, consecrated a bishop and came back to Ireland around 435 AD. Many legends are associated around St. Patrick: how he drove the snakes out of Ireland, and the use of the shamrock to teach the mystery of the Trinity. Whether or not the legends are true, St. Patrick succeeded in bringing Catholicism to Ireland, and in time, the whole country converted from their pagan gods to the one true God.

https://www.catholicculture.org/culture/liturgicalyear/calendar/day.cfm?date=2018-03-17

We have a few works attributed to St. Patrick, one being his autobiography called Confessions. It is a short summary of the events in his life, written in true humility. Below is a short excerpt:
I am greatly God's debtor, because he granted me so much grace, that through me many people would be reborn in God, and soon after confirmed, and that clergy would be ordained everywhere for them, the masses lately come to belief, whom the Lord drew from the ends of the earth, just as he once promised through his prophets: "To you shall the nations come from the ends of the earth, and shall say, Our fathers have inherited naught hut lies, worthless things in which there is no profit." And again: "I have set you to be a light for the Gentiles that you may bring salvation to the uttermost ends of the earth."

https://www.catholicculture.org/culture/liturgicalyear/calendar/day.cfm?date=2018-03-17

2
 It was there that the Lord opened up my awareness of my lack of faith. Even though it came about late, I recognised my failings. So I turned with all my heart to the Lord my God[Nota], and he looked down on my lowliness[Nota] and had mercy on my youthful ignorance. He guarded me before I knew him, and before I came to wisdom and could distinguish between good and evil. He protected me and consoled me as a father does for his son.



https://www.confessio.ie/etexts/confessio_english#

4
 This is because there is no other God, nor will there ever be, nor was there ever, except God the Father. He is the one who was not begotten, the one without a beginning, the one from whom all beginnings come, the one who holds all things in being – this is our teaching. And his son, Jesus Christ, whom we testify has always been, since before the beginning of this age, with the father in a spiritual way. He was begotten in an indescribable way before every beginning. Everything we can see, and everything beyond our sight, was made through him. He became a human being; and, having overcome death, was welcomed to the heavens to the Father. The Father gave him all power over every being, both heavenly and earthly and beneath the earth. Let every tongue confess that Jesus Christ, in whom we believe and whom we await to come back to us in the near future, is Lord and God[Nota]. He is judge of the living and of the dead[Nota]; he rewards every person according to their deeds[Nota]. He has generously poured on us the Holy Spirit[Nota], the gift and promise of immortality, who makes believers and those who listen to be children of God and co-heirs with Christ[Nota]. This is the one we acknowledge and adore – one God in a trinity of the sacred name.


https://www.confessio.ie/etexts/confessio_english#

6

Although I am imperfect in many ways, I want my brothers and relations to know what I’m really like, so that they can see what it is that inspires my life.

https://www.confessio.ie/etexts/confessio_english#

8
 So I should greatly dread, with fear and trembling, this sentence on that day, where nobody can avoid or escape, but all shall give complete account of the least of sins before the tribunal of the Lord Christ.

https://www.confessio.ie/etexts/confessio_english#

10

However, even though there’s truth in my excuse, it gets me nowhere. Now, in my old age, I want to do what I was unable to do in my youth. My sins then prevented me from really taking in what I read. But who believes me, even were I to repeat what I said previously? I was taken prisoner as a youth, particularly young in the matter of being able to speak, and before I knew what I should seek and what I should avoid. That is why, today, I blush and am afraid to expose my lack of experience, because I can’t express myself with the brief words I would like in my heart and soul.

https://www.confessio.ie/etexts/confessio_english#

12

So I am first of all a simple country person, a refugee, and unlearned. I do not know how to provide for the future. But this I know for certain, that before I was brought low, I was like a stone lying deep in the mud. Then he who is powerful came and in his mercy pulled me out, and lifted me up and placed me on the very top of the wall[Nota]. That is why I must shout aloud in return to the Lord for such great good deeds of his, here and now and forever, which the human mind cannot measure.

https://www.confessio.ie/etexts/confessio_english#