When asked "Does philosophy contribute to happiness?" (SHM 76), as quoted in The quotable Bertrand Russell (1993), p. 149
Attributed from posthumous publications

“Everything is vague to a degree you do not realize till you have tried to make it precise.”

Bertrand Russell

“The secret of happiness is this: let your interests be as wide as possible, and let your reactions to the things and persons that interest you be as far as possible friendly rather than hostile.”

Bertrand Russell book The Conquest of Happiness

Variant: The secret of happiness is very simply this: let your interests be as wide as possible, and let your reactions to the things and persons that interest you be as far as possible friendly rather than hostile
Source: 1930s, The Conquest of Happiness (1930)

“The opinions that are held with passion are always those for which no good ground exists; indeed the passion is the measure of the holder’s lack of rational conviction.”

Bertrand Russell

1960s
Source: Introduction to 1961 edition of Sceptical Essays (1961)
Context: The opinions that are held with passion are always those for which no good ground exists; indeed the passion is the measure of the holder’s lack of rational conviction. Opinions in politics and religion are almost always held passionately.

“Neither a man nor a crowd nor a nation can be trusted to act humanely or to think sanely under the influence of a great fear.”

Bertrand Russell

Source: 1950s, Unpopular Essays (1950)

en.wikiquote.org - Bertrand Russell / Quotes / 1950s / Unpopular Essays (1950)

“Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own.”

Bertrand Russell

Source: What I Believe

“I believe in using words, not fists… I believe in my outrage knowing people are living in boxes on the street. I believe in honesty. I believe in a good time. I believe in good food. I believe in sex.”

Bertrand Russell

No known source; also attributed to Susan Sarandon.[citation needed]
Disputed

“If there were in the world today any large number of people who desired their own happiness more than they desired the unhappiness of others, we could have a paradise in a few years.”

Bertrand Russell

As quoted in Think, Vol. 27 (1961), p. 32
Disputed

“Not to be absolutely certain is, I think, one of the essential things in rationality.”

Bertrand Russell

"Don't Be Too Certain!" <br class="br">1940s, Am I An Atheist Or An Agnostic? http://www.positiveatheism.org/hist/russell8.htm (1947) <br class="br">Source: Am I an Atheist or an Agnostic?

“The infliction of cruelty with a good conscience is a delight to moralists. That is why they invented Hell.”

Bertrand Russell

Source: 1920s, Sceptical Essays (1928), Ch. 1: The Value of Scepticism

“So far as I can remember there is not one word in the Gospels in praise of intelligence.”

Bertrand Russell

Source: 1930s, Education and the Social Order (1932), p. 110
Context: Owing to the identification of religion with virtue, together with the fact that the most religious men are not the most intelligent, a religious education gives courage to the stupid to resist the authority of educated men, as has happened, for example, where the teaching of evolution has been made illegal. So far as I can remember, there is not one word in the Gospels in praise of intelligence; and in this respect ministers of religion follow gospel authority more closely than in some others.

“Patriots always talk of dying for their country, and never of killing for their country.”

Bertrand Russell

Has Man a Future? (1962), p. 78
1960s