I arise today, through a mighty strength, the invocation of the Trinity,
Through belief in the Threeness, through confession of the Oneness
of the Creator of creation.
Saint Patrick wasn't just a leprechaun who could drink you under the table, he was also the figure largely credited with bringing Christianity to Ireland. The lines above are the opening of the "Breastplate of Saint Patrick", a prayer attributed to him, emphasizing the Christian doctrine of the Trinity. He supposedly illustrated this doctrine using a shamrock as an analogy. This would really be an illustration of the non-Christian doctrine of partialism, but it makes for a nice story and a good national symbol. Here is a scene of Patrick preaching by David FNJ, and shamrocks by Kreativ Snail and Plucky Duck.