"St. Augustine occupied himself with several religious works, and among others, a Treatise on the Trinity. One day, as he was walking up and down the shore, meditating on this mystery with his mother, they saw a little child, who, having dug a tiny hole in the sand, was filling it with sea-water out of a cockle-shell. Augustine, smiling, asked him whether he thought to empty the whole ocean into it? The child replied, "Why not? It would be easier than to get into your head the incomprehensible ocean of the Holy Trinity!""