Browsing the 'net - as you do, I got to one of those
quote sites. (I was looking for the origin of the quote 'In the beginning there was nothing. Then it exploded' (Turned out be from Terry Pratchett).
As I read on I came across a definition of reality coined by Dick "Reality is that which, when you stop believing in it, doesn't go away."
And this was the one quote with a source - I looked it up and it's a speech by Dick
How to build a Universe that doesn't fall apart two days later.
Please read it, it's full of amazing serendipities itself, such as scenes from his novels replicating narrative Biblical passages about which he was unaware. And, anyway - if you know much about Philip K Dick, you'll want to read more of what he has to say.
For those who don't know about him, he was an earlier imaginer of computer viruses, he had a quirky way of titling books - most of you have probably seen
Blade Runner - the book is
Do androids dream of electric sheep?, and most of his books were interesting investigations of reality and unreality.
When you check the link out, I'd love you to post a response back here.
Cheers
Ian