I agree as to the doubtful value of competitive examination. The qualities which you really want, viz., self-control, self-reliance, habits of accurate thought, integrity and what you generally call trustworthiness, are not decided by competitive examination, which test little else than the memory.
Florence Nightingale (1820-1910) English social reformer, statistician, founder of modern nursing
Letter to Lord Edward Geoffrey Stanley (17 May 1857)
(Source)
Regarding selection processes for military officers. This was undergoing reform during the period, including the radical proposal to prevent people from buying their way into lower officer ranks.
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But finally, there is one other quality I would mention among these that I believe will fit you for difficult and important posts. This is a healthy and lively sense of humor.
To delight in war is a merit in the soldier, a dangerous quality in the captain, and a positive crime in the statesman.