All that is gold does not glitter,
This line, and its reversal, is a foreshadowing of the perception of Aragorn. When we first meet him in Bree, he creeps out Frodo and is described in a somewhat prejudiced way by the innkeeper. His role then expands, as he leads the chase for Merry and Pippin, has the sword reforged, and so on. By the end of the books, he is king in Gondor.
The line is also an inversion of the famous remark by the Prince of Morocco in Shakespeare’s The Merchant of Venice (Act 2, Scene 7): “All that glisters [i.e., glitters] is not gold.”
If you got Shakespeare, Tolkien, and Smash Mouth together in a room to hash this out, there would be no consensus, but you’d fulfill the lifelong dream of a few million nerds born in 1983. Not to mention that Led Zeppelin referenced the line as well:
On a more tragic note, Thomas Gray incorporates this phrase into his “Ode on the Death of a Favorite Cat, Drowned in a Tub of Gold Fishes.”
To help improve the meaning of these lyrics, visit "All That Is Gold Does Not Glitter" by J. R. R. Tolkien and leave a comment on the lyrics box