From the, er, esteemed psychologist’s Psychology, A Briefer Course:

“With no attempt there can be no failure; with no failure no humiliation. So our self-feeling in this world depends entirely on what we back ourselves to be and do. It is determined by the ratio of our actualities to our supposed potentialities; a fraction of which our pretensions are the denominator and the numerator our success: Thus:

selfesteem

Such a fraction may be increased as well by diminishing the denominator as by increasing the numerator. To give up pretensions is as blessed a relief as to get them gratified; and where disappointment is incessant and the struggle unending, this is what men will always do. The history of evangelical theology, with its conviction of sin, its self-despair, and its abandonment of salvation by works, is the deepest of possible examples, but we meet others in every walk of life. There is a strange lightness in the heart when one’s nothingness in a particular area is accepted in good faith… How pleasant is the day when we give up striving to be young or slender. ‘Thank God!” we say, ‘those illusions are gone.’ Everything added to the Self is a burden as well as a pride.” (pg 168)

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