“Never let yourself be diverted, either by what you wish to believe, or what you think could have beneficent social effects if it were believed; but look only and solely at what are the facts.”
Response to the question "Suppose Lord Russell, this film were to be looked at by our descendants, like a dead sea scroll in a thousand years time. What would you think it's worth telling that generation about the life you've lived and the lessons you've learned from it?" in a BBC interview on "Face to Face" (1959) http://www.youtube.com/watch?v=_3aPkzHpT8M
1950s
Context: When you are studying any matter, or considering any philosophy, ask yourself only: What are the facts, and what is the truth that the facts bear out. Never let yourself be diverted, either by what you wish to believe, or by what you think would have beneficent social effects if it were believed; but look only and solely at what are the facts.
Context: I should like to say two things. One intellectual and one moral. The intellectual thing I should want to say to them is this: "When you are studying any matter, or considering any philosophy, ask yourself only: What are the facts, and what is the truth that the facts bear out. Never let yourself be diverted, either by what you wish to believe, or by what you think would have beneficent social effects if it were believed; but look only and solely at what are the facts." That is the intellectual thing that I should wish to say. The moral thing I should wish to say to them is very simple; I should say: "Love is wise – Hatred is foolish." In this world, which is getting more and more closely interconnected, we have to learn to tolerate each other. We have to learn to put up with the fact, that some people say things we don't like. We can only live together in that way. But if we are to live together, and not die together, we must learn a kind of charity and a kind of tolerance which is absolutely vital, to the continuation of human life on this planet.
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Bertrand Russell 562
logician, one of the first analytic philosophers and politi… 1872–1970Related quotes

“You either believe what you think or you question it. There’s no other choice.”
Loving What Is: Four Questions That Can Change Your Life (2002)

“Would you believe in what you believe in if you were the only one who believed it?”
Source: p.19 Thank You and You're Welcome (2009)

“You are what you believe yourself to be.”
Source: The Witch of Portobello (2007), p. 152.
Context: You are what you believe yourself to be.
Don't be like those people who believe in "positive thinking" and tell themselves that they're loved and strong and capable. You don't need to do that because you know it already. And when you doubt it — which happens, I think, quite often at this stage of evolution — do as I suggested. Instead of trying to prove that you're better than you think, just laugh. Laugh at your worries and insecurities. View your anxieties with humor. It will be difficult at first, but you'll gradually get used to it. Now go back and meet all those people who think you know everything. Convince yourself that they're right, because we all know everything, it's merely a question of believing.
Believe.

Earliest attribution found in Who Said That?: More than 2,500 Usable Quotes and Illustrations https://books.google.nl/books?id=7mn8AwAAQBAJ&pg=PT63 (1995) by George Sweeting. Online sources always attribute the quote to Augustine, but never specify in which of his works it is to be found.
Disputed

As quoted at the J. Paul Getty Museum http://www.getty.edu/art/gettyguide/artMakerDetails?maker=333&page=1