“To discover evil in a new friend is to most people only an additional experience”

The Duchess of Cornwall to children
Reading is cool so please find the time, Camilla tells children The Evening Standard 1 March 2012 http://www.standard.co.uk/news/get-london-reading/reading-is-cool-so-please-find-the-time-camilla-tells-children-7498850.html

Speech https://hansard.parliament.uk/Commons/1979-11-26/debates/294bd8ba-7ace-4fab-9f9c-12be13ccb2ad/CommonsChamber#contribution-6ae9a2db-2e77-4e8d-8630-d90f5f7d8d0e in the House of Commons (26 November 1979)
1970s

Interview by Matt Ryan for MAGNET magazine

Source: A Path with Heart: A Guide Through the Perils and Promises of Spiritual Life

" Trust me, being sacked isn't all bad http://www.telegraph.co.uk/opinion/main.jhtml?xml=/opinion/2004/12/02/do0202.xml", Daily Telegraph, 2 December 2004, p. 26.
On being sacked from the Tory front bench.
2000s, 2004

Cemetery World (1973)
Context: I find it a most intriguing and amusing thing that it might be possible to package the experiences, not only of one's self, but of other people. Think of the hoard we might then lay up against our later, lonely years when all old friends are gone and the opportunity for new experiences have withered. All we need to do then is to reach up to a shelf and take down a package that we have bottled or preserved or whatever the phrase might be, say from a hundred years ago, and uncorking it, enjoy the same experience again, as sharp and fresh as the first time it had happened... I have tried to imagine... the various ingredients one might wish to compound in such a package. Beside the bare experience itself, the context of it, one might say, he should want to capture and hold all the subsidiary factors which might serve as a background for it — the sound, the feel of wind and sun, the cloud floating in the sky, the color and the scent. For such a packaging, to give the desired results, must be as perfect as one can make it. It must have all those elements which would be valuable in invoking the total recall of some event that had taken place many years before...

Variant: One of the great secrets of life. Most people die of a sort of creeping common sense and discover too late that the only things one never regrets are one's mistakes.
Source: The Picture of Dorian Gray

Joyce Lovelace, Who Was Aileen Osborn Webb? http://www.craftcouncil.org/magazine/article/who-was-aileen-osborn-webb, July 25, 2011, American Craft Council

Introduction<!-- p. 5 -->
Space—Time—Matter (1952)
Context: It is the nature of a real thing to be inexhaustible in content; we can get an ever deeper insight into this content by the continual addition of new experiences, partly in apparent contradiction, by bringing them into harmony with one another. In this interpretation, things of the real world are approximate ideas. From this arises the empirical character of all our knowledge of reality.