“…If ever I murdered somebody," he added quite simply, "I dare say it might be an Optimist."
"Why?" cried Merton amused. "Do you think people dislike cheerfulness?”
"People like frequent laughter," answered Father Brown, "but I don't think they like a permanent smile. Cheerfulness without humour is a very trying thing."
The Innocence of Father Brown (1911) The Three Tools of Death
The Father Brown Mystery Series (1910 - 1927)
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G. K. Chesterton 229
English mystery novelist and Christian apologist 1874–1936Related quotes

“I think sometimes people think cheerful is a synonym for dumb, so no one is ever cheerful.”
Source: Is Everyone Hanging Out Without Me?

From interview with Rajeev Masand

“On one occasion the people cheered the team he opposed; he cried angrily: "I wish all you Romans had only one neck!"”
Infensus turbae faventi adversus studium suum exclamavit: "Utinam p. R. unam cervicem haberet!"
Source: The Twelve Caesars, Gaius Caligula, Ch. 30

Final lines of his Richard Dimbleby lecture Shaking Hands With Death on euthanasia and assisted suicide, quoted in "Terry Pratchett: my case for a euthanasia tribunal" in The Guardian (2 February 2010) http://www.guardian.co.uk/society/2010/feb/02/terry-pratchett-assisted-suicide-tribunal
General sources
Context: I dare say that quite a few people have contemplated death for reasons that much later seemed to them to be quite minor. If we are to live in a world where a socially acceptable "early death" can be allowed, it must be allowed as a result of careful consideration.
Let us consider me as a test case. As I have said, I would like to die peacefully with Thomas Tallis on my iPod before the disease takes me over and I hope that will not be for quite some time to come, because if I knew that I could die at any time I wanted, then suddenly every day would be as precious as a million pounds. If I knew that I could die, I would live. My life, my death, my choice.

“This thought cheered Bozo, I do not know why. He was a very exceptional man.”
Source: Down and out in Paris and London (1933), Ch. 30
Context: He was an embittered atheist (the sort of atheist who does not so much disbelieve in God as personally dislike Him), and took a sort of pleasure in thinking that human affairs would never improve. Sometimes, he said, when sleeping on the Embankment, it had consoled him to look up at Mars or Jupiter and think that there were probably Embankment sleepers there. He had a curious theory about this. Life on earth, he said, is harsh because the planet is poor in the necessities of existence. Mars, with its cold climate and scanty water, must be far poorer, and life correspondingly harsher. Whereas on earth you are merely imprisoned for stealing sixpence, on Mars you are probably boiled alive. This thought cheered Bozo, I do not know why. He was a very exceptional man.