Success brings us more happiness when we work hard for it. Which detail from "The Three Brass Pennies" helps develop this theme?

“'After all, we are but human!” he mused. “Tuan See is no worse than I. But what am I to do now?” He spent the night in considering the question, and in the early morning sought once more the magician in the Street of the Purple Lantern."

"It was as if Ah Fo had been struck a blow in the face. He could not have imagined such duplicity in the heretofore absolutely cordial and devoted friend. And yet, quick on its heels, came the memory that he had not infrequently felt the same way himself. This reading of other people’s minds certainly had its inconveniences!"

"Hurriedly he changed his plans again, with the thought of a western route across the country, this time to discover himself lost in a burning desert, parched with thirst, stricken with a fever, and perishing alone under the pitiless sun."

“'If you would grant me three wishes, let them, I pray you, be these. Allow me to forget all that I have learned through the agency of these terrible pennies; give me a contented mind; and lastly, allow me to return to my studies with a new zest and the determination to rise by my own honest effort above all obstacles. It is all that I would ask!'”