The old that is strong does not wither,
Deep roots are not reached by the frost.

from J. R. R. Tolkien – All That Is Gold Does Not Glitter on Rap Genius

Meaning

“Deep roots are not reached by the frost” refers to the fact that the line of Isildur survives the fall of Arnor, the north kingdom of the Dunedain, to the Witch-King of Angmar.

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