“A man may be so much of every thing, that he is nothing of any thing.”
1783, p. 500
Life of Samuel Johnson (1791), Vol IV
Source: The Life of Johnson, Vol 4
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Samuel Johnson 362
English writer 1709–1784Related quotes

Vol. V, par. 211
Collected Papers (1931-1958)

Source: Looking Backward, 2000-1887 http://www.gutenberg.org/ebooks/25439 (1888), Ch. 21.

1
Auxiliaries to the Perception of Intelligible Natures

Journals and Papers X4A 435
1840s, The Journals of Søren Kierkegaard, 1840s

“A man may imagine things that are false, but he can only understand things that are true.”

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 561.

Gilbert Keith Chesterton, as per Mackay's The Harvest of a Quiet Eye, A Selection of Scientific Quotations (1977), p. 34.
Misattributed