How many languages do u know??

Which statement about thoreau's rhetorical style is most accurate?

In this excerpt from "colonialism in the united states" by henry c. lodge, which word is closest in meaning to the word indelibly? long after the world to which it belonged has vanished, a habit of thought will live on, indelibly imprinted upon a race or nation, like the footprint of some extinct beast or bird upon a piece of stone.

What key advice did the old-timer give him?