“You have been to the Riviera before, Georges?” said Poirot to his valet the following morning.
George was an intensely English, rather wooden-faced individual.
“Yes, sir. I was here two years ago when I was in the service of Lord Edward Frampton.”
“And to-day,” murmured his master, “you are here with Hercule Poirot. How one mounts in the world!”

What It Means

This is a placeholder explanation generated by the low-overhead model. It interprets "“You have been to the Riviera before, Georges?” said Poirot to his valet the following morning.
George was an intensely English, rather wooden-faced individual.
“Yes, sir. I was here two years ago when I was in the service of Lord Edward Frampton.”
“And to-day,” murmured his master, “you are here with Hercule Poirot. How one mounts in the world!”" in the context of "" to mean that wisdom is timeless.