“To say categorically, 'There is no God,' is to make an absolute statement. For the statement to be true, I must know for certain that there is no God in the entire universe. No human being has all knowledge. Therefore, none of us is able to truthfully make this assertion.”
God doesn't believe in atheists (2002)
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Ray Comfort 133
New Zealand-born Christian minister and evangelist 1949Related quotes

The Philosophy of Physical Science (1938)
Context: For the truth of the conclusions of physical science, observation is the supreme Court of Appeal. It does not follow that every item which we confidently accept as physical knowledge has actually been certified by the Court; our confidence is that it would be certified by the Court if it were submitted. But it does follow that every item of physical knowledge is of a form which might be submitted to the Court. It must be such that we can specify (although it may be impracticable to carry out) an observational procedure which would decide whether it is true or not. Clearly a statement cannot be tested by observation unless it is an assertion about the results of observation. Every item of physical knowledge must therefore be an assertion of what has been or would be the result of carrying out a specified observational procedure. <!-- p. 9
Hermann Bondi, Assumption and Myth in Physical Theory, (1967) p. 11

The Value of Science (1955)
Context: The scientist has a lot of experience with ignorance and doubt and uncertainty, and this experience is of very great importance, I think. When a scientist doesn’t know the answer to a problem, he is ignorant. When he has a hunch as to what the result is, he is uncertain. And when he is pretty darn sure of what the result is going to be, he is still in some doubt. We have found it of paramount importance that in order to progress we must recognize our ignorance and leave room for doubt. Scientific knowledge is a body of statements of varying degrees of certainty — some most unsure, some nearly sure, but none absolutely certain. Now, we scientists are used to this, and we take it for granted that it is perfectly consistent to be unsure, that it is possible to live and not know. But I don’t know whether everyone realizes this is true. Our freedom to doubt was born out of a struggle against authority in the early days of science. It was a very deep and strong struggle: permit us to question — to doubt — to not be sure. I think that it is important that we do not forget this struggle and thus perhaps lose what we have gained.
“But mere plausibility did not make the statement true.”
Source: The Heritage Universe, Summertide (1990), Chapter 6, “Summertide Minus Twenty-Nine” (p. 65)

“When I make a statement of facts within my knowledge I expect it to be accepted.”
To Joseph Stalin in 1944, on the fact that there had been no plot between Britain and Germany to invade the Soviet Union. The Grand Alliance, Winston S. Churchill.
The Second World War (1939–1945)
interview with Johns conducted in 1975 at Johns’ studio by Yoshiaki Tono, as quoted in Jasper Johns, Writings, sketchbook Notes, Interviews, ed. Kirk Varnedoe, Moma New York, 1996, p. 89
1970s