“It is the usual though inequitable method of the world, to pronounce an action to be either right or wrong, as it is attended with good or ill success.”
Letter 9, 7.
Letters, Book V
Original
Est omnino iniquum, sed usu receptum, quod honesta consilia vel turpia, prout male aut prospere cedunt, ita vel probantur vel reprehenduntur.
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Pliny the Younger 50
Roman writer 61–113Related quotes

Source: Eric Chu (2019) cited in " Eric Chu vies against KMT chair over primary rules http://www.taipeitimes.com/News/taiwan/archives/2019/01/06/2003707456" on Taipei Times, 6 January 2019.

“There's no right or wrong, success or failure.”

“The only true method of action in this world is to be in it, but not of it.”
Reported in Josiah Hotchkiss Gilbert, Dictionary of Burning Words of Brilliant Writers (1895), p. 622.
Article in the New York Herald Tribune (17 February 1957)

"Shoaku makusa : Not Doing Wrong Action" as translated by Anzan Hoshin roshi and Yasuda Joshu Dainen roshi (2007)