On a visit to Ireland, I was overwhelmed by the abundance of decorative shamrocks. The little green, three-leafed plant could be found in every store on seemingly everything—clothing, hats, jewelry, and more!

More than just a prolific plant across Ireland, the shamrock was embraced for generations as a simple way to explain the Trinity, the historic Christian belief that God is One essence who eternally exists in three distinct persons: God the Father, God the Son and God the Holy Spirit. While all human explanations of the Trinity are inadequate, the shamrock is a helpful symbol because it is one plant made of the same substance with three distinct leaves.

The word “Trinity” isn’t found in Scripture, but it summarizes the theological truth we see explicit in passages where all three persons of the Trinity are present at the same time. When Jesus, God the Son, is baptized, God the Spirit is seen coming down from heaven “like a dove,” and God the Father’s voice is heard saying, “You are my Son” (Mark 1:11).

The Irish used the shamrock because they wanted to help people know God. As we more fully understand the beauty of the Trinity, it helps us know God and deepens our ability to worship Him “in spirit and truth” (John 4:24).