Read "The Story of the Treasure Seekers" by Edith Nesbit online for free on Textopian. Full text with search, annotations, highlights, and AI-powered reading aids.
The part about his nobleness only comes at the end, but you would not understand it unless you knew how it began. It began, like nearly everything about that time, with treasure-seeking.
Of course as soon as we had promised to consult my Father about business matters we all gave up wanting to go into business. I don't know how it is, but having to consult about a thing with grown-up people, even the bravest and the best, seems to make the thing not worth doing afterwards.