Various interpretations of the Celtic cross abound. In religious history, the circle indicated the continuous nature of God's love, and the cross served as a reminder of the sacrifice that Christ underwent in order to ensure that love for all believers. A popular legend credits St. Patrick with placing a circle, a symbol for the moon, over the Christian cross when he was spreading the word of God to pagans in the fifth century. Now, any individual can assign personal meaning to this shape and use it ornamentally. The Celtic knot also finds its roots in the Christian faith system, as the three corners of the symbol once represented the three elements of the Holy Trinity. While many people still view the knot this way, others think of the interconnected loops as reminders of life's eternally flowing and changing properties.