We can neither define what we mean by truth nor be in doubt as to our meaning.
 Samuel Butler, The Note-Books of Samuel Butler (1912). copy citation

add
Author Samuel Butler
Source The Note-Books of Samuel Butler
Topic truth doubt
Date 1912
Language English
Reference
Note
Weblink http://www.gutenberg.org/files/6173/6173-h/6173-h.htm

Context

“Practically everything should be seen as itself pure and simple, so far as we can comfortably see it, and at the same time as not itself, so far as we can comfortably see it, and then the two views should be combined, so far as we can comfortably combine them. If we cannot comfortably combine them, we should think of something else. Truth i We can neither define what we mean by truth nor be in doubt as to our meaning. And this I suppose must be due to the antiquity of the instinct that, on the whole, directs us towards truth. We cannot self-vivisect ourselves in respect of such a vital function, though we can discharge it normally and easily enough so long as we do not think about it.” source