“Do not allow your dreams of a beautiful world to lure you away from the claims of men who suffer here and now.”
Source: Conjectures and Refutations: The Growth of Scientific Knowledge (1963), p. 485
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Karl Popper 82
Austrian-British philosopher of science 1902–1994Related quotes

On science fiction writers, Guest of Honor speech at the Millennium Philcon 59th World Science Fiction Convention (2001), from Women in Deep Time (2002), ed. ibooks

Source: On 30 August 2018, De Lille spoke to 130 residents of a women's shelter in Cape Town. As quoted by Dave Chambers in Like you‚ I will survive‚ De Lille tells abused women https://www.timeslive.co.za/news/south-africa/2018-08-30-like-you-i-will-survive-de-lille-tells-abused-women/. TimesLIVE, (30 August 2018)

Alfred Cortot: Master Class on Schumann Kinderszenen (1953) http://www.youtube.com/watch?v=rNUNNNNj_Qw

This quote has been attributed to Mark Twain, but the attribution cannot be verified. The quote should not be regarded as authentic. — Twainquotes http://www.twainquotes.com/Discovery.html
Actually from the 1990 book P. S. I Love You' https://books.google.com/books?id=5OORXU6rlGIC&q=bowlines#v=onepage&q=bowlines&f=false' by H. Jackson Brown.
Misattributed

Sun-being (démon; spirit) to Cyrano
The Other World (1657)
Context: You are now bearing the punishment for the shortcomings of your world. Here, as in your world, there are benighted people who cannot tolerate thinking about things they are not accustomed to. But you realize that you are being treated here the same as there. If someone from this world came to yours with the audacity to call himself a man, your learned men would stifle him for being a monster or a monkey possessed by the Devil.