“Doubt must be no more than vigilance, otherwise it can become dangerous.”
F 53
Aphorisms (1765-1799), Notebook F (1776-1779)
Help us to complete the source, original and additional information
Georg Christoph Lichtenberg 137
German scientist, satirist 1742–1799Related quotes

“There can be no mistake more inexcusable and fatal than to doubt, disobey, or neglect the Bible.”
The Divine Origin of the Bible (1899)
“The more articulate one is, the more dangerous words become.”

“The more you ask certain questions, the more dangerous they become.”
Source: The Judges

1967
Directives Regarding the Cultural Revolution (1966-1972)

“A lie is more comfortable than doubt, more useful than love, more lasting than truth.”
[The Autumn of the Patriarch, 2006 [1976], HarperCollins, 978-0-06-088286-0, 254] translated from El Ontoño del Patriarica (1975) by Gregory Rabassa

From the Enchiridion (1640) of Francis Quarles.
Misattributed

Source: Quotes from secondary sources, Dictionary of Burning Words of Brilliant Writers, 1895, P. 245.