The next couplet is: A car travels a thousand miles.

The car travels ten thousand miles

The ambition to read a thousand books

"Aspire to read a thousand books" means to aspire to read a lot of books.

"Car" versus "Zhi": noun pairing and leveling.

"To read" is the same as "to walk": the verb is the same as the verb, and the level is the same as the oblique.

"Ten thousand miles" versus "a thousand scrolls": noun versus noun, unevenness is not in order.

"Road" versus "book": noun versus noun, level versus oblique.