Trinity sermon example

The story is told of St Augustine of Hippo, a great philosopher and theologian who wanted so much to understand the doctrine of the Trinity and to be able to explain it logically. One day as he was walking along the sea shore and reflecting on this, he suddenly saw a little child all alone on the shore. The child made a whole in the sand, ran to the sea with a little cup, filled her cup, came and poured it into the hole she had made in the sand. Back and forth she went to the sea, filled her cup and came and poured it into the hole. Augustine went up to her and said, "Little child, what are doing?" and she replied, "I am trying to empty the sea into this hole." "How do you think," Augustine asked her, "that you can empty this immense sea into this tiny hole and with this tiny cup?" To which she replied, " And you, how do you suppose that with this your small head you can comprehend the immensity of God?" With that the child disappeared.