“If we experience any failures or setbacks, we do not forget them because they offend our self-esteem. Instead we reflect on them deeply, trying to figure out what went wrong and discern whether there are any patterns to our mistakes.”
Source: Mastery
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Robert Greene 111
American author 1959Related quotes

“When we are confronted by failure and mistakes, we can leave them behind and go on with our lives.”
Source: Think Big: Unleashing Your Potential for Excellence

Interview with Stanley Koehler (April 1962), in The Paris Review : Writers at Work, 3rd series, Viking Penguin, p. 29
General sources
Context: The art of the poem nowadays is something unstable; but at least the construction of the poem should make sense; you should know where you stand. Many questions haven't been answered as yet. Our poets may be wrong; but what can any of us do with his talent but try to develop his vision, so that through frequent failures we may learn better what we have missed in the past.

Source: Human Nature and the Social Order, 1902, p. 182 (1922)

Said to Michael Silverberg of NPR; quote featured in the Buffy Monster Book (2000)
Context: I think there's a lot of people out there who say we must not have horror in any form, we must not say scary things to children because it will make them evil and disturbed... That offends me deeply, because the world is a scary and horrifying place, and everyone's going to get old and die, if they're that lucky. To set children up to think that everything is sunshine and roses is doing them a great disservice. Children need horror because there are things they don't understand. It helps them to codify it if it is mythologized, if it's put into the context of a story, whether the story has a happy ending or not. If it scares them and shows them a little bit of the dark side of the world that is there and always will be, it's helping them out when they have to face it as adults.
February 1957, quoted in Michael McManus Jo Grimond: Towards the Sound of Gunfire (Birlinn, 2001) p. 120.