“Doubt is not always a sign that a man is wrong; it may be a sign that he is thinking.”

Last update June 3, 2021. History

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Oswald Chambers43

British missionary 1874–1917

Related quotes

“The first sign of senility is that a man forgets his theorems, the second sign is that he forgets to zip up, the third sign is that he forgets to zip down.”

Paul Erdős (1913–1996) Hungarian mathematician and freelancer

Though Erdős used this remark, it is said to have originated with his friend Stanisław Ulam, as reported in The Man Who Loved Only Numbers : The Story of Paul Erdős and the Search for Mathematical Truth (1998) by Paul Hoffman
Variants:
The first sign of senility is when a man forgets his theorems. The second sign is when he forgets to zip up. The third sign is when he forgets to zip down.
As quoted in Wonders of Numbers : Adventures in Mathematics, Mind, and Meaning (2002) by Clifford A. Pickover, p. 64
There are three signs of senility. The first sign is that a man forgets his theorems. The second sign is that he forgets to zip up. The third sign is that he forgets to zip down.
Misattributed

“The first sign of senility is that a man forgets his theorems, the second sign is that he forgets to zip up, the third sign is that he forgets to zip down.”

Stanislaw Ulam (1909–1984) Polish-American mathematician

Attributed in Paul Hoffman, The Man Who Loved Only Numbers: The Story of Paul Erdős and the Search for Mathematical Truth (1998)
This has also been attributed, with variants, to Paul Erdős, who repeated the remark.

“He whom God has touched will always be a being apart: he is, whatever he may do, a stranger among men; he is marked by a sign.”

Ernest Renan (1823–1892) French philosopher and writer

Oeuvres Complètes, vol. 3. L’Avenir de la Science (1890).

“Man is the only animal that contemplates death, and also the only animal that shows any sign of doubt of its finality.”

William Ernest Hocking (1873–1966) American philosopher

The Meaning of Immortality in Human Experience (1957), p. 5.
Context: Man is the only animal that contemplates death, and also the only animal that shows any sign of doubt of its finality. This does not mean that he doubts it as a future fact. He accepts his own death, with that of others, as inevitable; plans for it; provides for the time when he shall be out of the picture. Yet, not less today than formerly, he confronts this fact with a certain incredulity regarding the scope of its destruction.