Life is a pilgrimage that starts with the Trinity and ends with the Trinity.  We'll consider the exitus-reditus of St. Thomas Aquinas in Tolkien's Lord of the Rings. Nota Bene:  Although removed in the 1971 Liturgy of the Hours, the Athansian Creed was in every Roman Breviary for hundreds of years.  Here is a good English translation of that supreme confession of the faith in the Trinity: Whosoever will be saved, before all things it is necessary that he hold the Catholic Faith. Which Faith except everyone do keep whole and undefiled, without doubt he shall perish everlastingly. And the Catholic Faith is this, that we worship one God in Trinity and Trinity [...]