In his book The Jesus Prayer: A Cry for Mercy, a Path of Renewal, John Michael Talbot tells this story:
Bishop Augustine was preaching his series of homilies on the Trinity in the cathedral of Hippo. Between services he would walk to the seashore to meditate and rest his mind. He saw a boy on the shore digging a hole and then filling the hole with a bucket of seawater. He did this repeatedly. Finally Augustine walked over to the boy and asked, “Son, what are you doing?” The boy replied, “I am going to take that big ocean and put it in this little hole.” The wise and fatherly Augustine said kindly to the boy, “My son, the ocean is too big to place in that little hole.” The boy looked up at the bishop and said, “Easier for me to take that big ocean and put it in this little hole than for you to take the big Trinity and put it in your little mind, Bishop Augustine!” At that the boy disappeared. He was an angel sent by God to remind Augustine that sublime as his teaching might be, he could never fully understand or express the divine mysteries of the Trinity (or the incarnation, for that matter).
The words we utter about God should always be spoken with humility, for the reality is far greater than that which the human mind could ever comprehend or behold. And yet, on this night, Christian people proclaim that this God came in the form of a child, in the person of Jesus, and in and through him, delivered salvation to the world.