The Liberty of Man, Woman and Child (1877)
“If you have seen a man misbehave once, do not from thence conclude him a fool; if you find he has been in a mistake in one particular, do not at once conclude him void of understanding : by that way of judging, you can entertain a favourable opinion of no man upon earth, nor even of yourself.”
The Dignity of Human Nature (1754)
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James Burgh 49
British politician 1714–1775Related quotes
“You can easily judge the character of a man by how he treats those who can do nothing for him.”
Source: Leaders Eat Last: Why Some Teams Pull Together and Others Don't
Quoted in The Perfect Way in Diet by Anna Kingsford (London: Kegan Paul, Trench & Co., 1881), p. 14 https://archive.org/stream/perfectwayindie00kinggoog#page/n36.
Letter to his father, 13 April 1738, printed in Memoirs of Benjamin Franklin (Philadelphia, 1834), volume 1, p. 233. Also quoted in Benjamin Franklin: An American Life (2003) by Walter Isaacson
Epistles
The Notebooks of Leonardo da Vinci (1883), XXI Letters. Personal Records. Dated Notes.
Franklin himself calls this an "old maxim" when he repeats it at page 48 http://www.ushistory.org/franklin/autobiography/page48.htm of his autobiography.
Franklin's recognition of this effect caused it to be named after him. Wikipedia, Ben Franklin Effect https://en.wikipedia.org/wiki/Ben_Franklin_effect.
Misattributed
1840s, Heroes and Hero-Worship (1840), The Hero as Prophet
Watchword for the Roman Republic (1849)