“I act with complete certainty. But this certainty is my own.”
Source: On Certainty
Help us to complete the source, original and additional information
Ludwig Wittgenstein 228
Austrian-British philosopher 1889–1951Related quotes

“The public…demands certainties…But there are no certainties.”
Source: 1910s, Prejudices, First Series (1919), Ch. 3

“Tolerance grows only when faith loses certainty; certainty is murderous.”

“The scientist believes in proof without certainty, the bigot in certainty without proof.”
The second sentence is often misquoted as “Science has proof without any certainty. Creationists have certainty without any proof.” or “Religion gives us certainty without proof; science gives us proof without certainty.”
Context: Bigotry and science can have no communication with each other, for science begins where bigotry and absolute certainty end. The scientist believes in proof without certainty, the bigot in certainty without proof. Let us never forget that tyranny most often springs from a fanatical faith in the absoluteness of one’s beliefs.

As quoted in What Billingsgate Thought: A Country Gentleman's Views on Snobbery (1919) by William Alexander Newman Dorland

Source: The Sayings and Teachings of the Great Mystics of Islam (2004), p. 29