These words, spoken by the mother of Aragorn, encompass the true meaning of Aragorn's life. Born as one of the Dunedain Rangers of the North, Aragorn was the last of a kingly line long diminished. Three thousand years before, his forefathers Isildur and Elendil had fought for the freedom of Middle-Earth and had defeated the Dark Lord Sauron, ending the shadow of his threat - for a time. When Elendil perished in the battle, Isildur, in anger, struck the Master Ring of Power from Sauron's hand. Instead of destroying the One Ring, Isildur kept it and thereby the evil survived.
Time went on and Isildur was killed by Orcs in the north-country. The Ring was lost and Isildur's line was kept alive only by his youngest son, Valandil, who was in Rivendell with his mother. From him, the Kings of the Northern Kingdom came until it's downfall was brought about hundreds of years later by the Witch-King of Angmar. It was then that they became the Rangers, the protectors of the Northern Peoples of Middle-Earth and heirs of a much greater destiny than they possessed.
Jesus came from a similar background. Adam, the first man, had lived in the bliss of Eden but when he had the chance to resist temptation, he gave in to sin and ate the fruit of the forbidden tree. This is likened to Isildur's usage of the Ring. Adam's descendants, or more specifically, Jacob's, were blessed to be the Chosen People of God. They flourished, especially during the reigns of David and Solomon. Their's was a dynasty of greater nobility that had not existed on Earth before. Before long, the kingdom was broken and the Israelites were diminished.
Centuries later, Jesus, a descendant of the kingly line of David was born just as, in the Lord of the Rings, Aragorn of the House of Elendil was born. This was not their only similarity. Both Aragorn and Jesus spent their lives wandering - helping the people that lived around them and more.
This is where the picture begins to differentiate. Jesus went on to sacrifice himself on the cross for the sins of men but he left the promise of his return to establish the Millenial Kingdom. In this the parallels return. The War of the Ring is reaching its climax as Frodo Baggins and his companion, Samwise Gamgee, draw nearer to Mount Doom in Mordor. Aragorn rises in importance as he assists King Theoden of Rohan in defeating the Uruk-Hai armies of Saruman. Summoning forth an army that even Sauron cannot withstand, Aragorn arrives in Minas Tirith at the height of the greatest battle of the Third Age: the Battle of Pelennor Fields.
The hosts of Gondor are greatly besieged. It is like the Armegeddon of Middle-Earth, all the forces of evil and good fight for keeps. The champion of this battle decides the fate of many. It is when all hope seems lost that Aragorn comes through with his long-dead armies. He is hailed as the Returning King. Under his leadership, the hosts of the Enemy are pushed back. This is where we see the Second Coming of Christ Tolkien-style. Jesus will return "at the end of all things" and defeat the enemies once and for all.
I would like to remind you that Tolkien never intended to write an allegory. In fact, he was ever against writing between the lines in that way. His unmistakable loyalty to the Word of God and the Truth of His Name, however, wove itself into his epic tale. From Aragorn, we see a vigorous picture of our Great King.