One of the best and most ancient spiritual analogies that describes our life here on earth is the ship sailing towards the harbor of heaven. Saint Thérèse explained that it was one of her favorite analogies:
“[T]he symbol of a ship always delights me and helps me to bear the exile of this life. Does not the Wise Man tell us—”Life is like a ship that passeth through the waves: when it is gone by, the trace thereof cannot be found”? – Saint Thérèse of Lisieux, The Story of a Soul.