“I sometimes think that we worry ourselves overmuch about the enduring consequences of our errors. They may work a little confusion for a time. In the end, they will be modified or corrected or their teachings ignored. The future takes care of such things. In the endless process of testing and retesting, there is a constant rejection of the dross, and a constant retention of whatever is pure and sound and fine.”

SGU, Podcast #352 – April 14th, 2012 http://www.theskepticsguide.org/podcast/sgu/352
The Skeptics' Guide to the Universe, Podcast, 2010s

Academy of Achievement interview (1991)
Context: The idea of being constructive, creative, positive, in trying to bring out the best in one's own self and the best in others follows from what I've just been saying. Again, I repeat my belief in us, in ourselves, as the product of the process of evolution, and part of the process itself. I think of evolution as an error-making and error-correcting process, and we are constantly learning from experience. It's the need to dedicate one's self in that way, to one's own self, and to choose an activity or life that is of value not only to yourself but to others as well.

From Certainty to Uncertainty (2002)

Translation from the Dhammapada of Gautama Buddha, as translated in The Dharma, or The Religion of Enlightenment; An Exposition of Buddhism (1896)

Source: Pali Canon, Sutta Pitaka, Khuddaka Nikaya (Minor Collection), Dhammapada, Ch. 165, as translated in The Dharma, or The Religion of Enlightenment; An Exposition of Buddhism (1896) by Paul Carus; variants for some years have included "We ourselves must walk the path but Buddhas clearly show the way", but this is not yet located in any of the original publications of Carus.

Attributed without citation at John Cale Quotes, inspirationalstories.com, 16 November 2012 http://www.inspirationalstories.com/quotes/t/john-cale/,

Source: Drenai series, The Swords of Night and Day, Ch. 14

Interview with ARTNews (3 March 2020)