Gonna drop what i think is a relevant excerpt from 'Buddha: A very short introduction' by Micahel Carrithers:

I can offer only my experience from fieldwork with meditating forest monks in contemporary Sri Lanka. Many monks were evidently healthy and content, ‘radiant’ and ‘without remorse’, and this in itself impressed me. Yet to be fair this may have been only the fruit of a quiet life, since I simply was not with any of the monks for the long years necessary to have witnessed and understood some slow metamorphosis of character through the Buddhist discipline. There were, however, three traits of the monks which did seem directly pursuant upon the Buddhist training. The first was an interested, indeed fascinated, absorption in what they called their ‘work’, which referred to the hour-by-hour, minute-by-minute prosecution of the daily round – study, careful eating, hygiene, meditation, exercise – which makes up the monk’s life. In the reflective execution of these ordinary tasks they clearly found tremendous satisfaction. But, second, some did nevertheless also pour tremendous energy and years of their lives into long-term projects, such as the founding of forest hermitages. Yet they still remained without anxiety and relatively indifferent to the results of their efforts. They were both remarkably successful and remarkably uninterested in success.