This might be tragically obvious, but I thought rather than expounding yet more of my stuff, I would let the people whose words I respect the most speak for themselves.
“The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it.” – Terry Pratchett
“One of the advantages of being disorderly is that one is constantly making exciting discoveries.” – A A Milne
“Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so.” – Douglas Adams
“It was so much easier to blame it on Them. It was bleakly depressing to think that They were Us. If it was Them, then nothing was anyone’s fault. If it was us, what did that make Me? After all, I’m one of Us. I must be. I’ve certainly never thought of myself as one of Them. No one ever thinks of themselves as one of Them. We’re always one of Us. It’s Them that do the bad things.” – Terry Pratchett
“My imagination makes me human and makes me a fool; it gives me all the world and exiles me from it”- Ursula K Le Guin
“Everyone is corrupted by hotel rooms” – Dylan Moran
“Anything that is in the world when you’re born is normal and ordinary and is just a natural part of the way the world works. Anything that’s invented between when you’re fifteen and thirty- five is new and exciting and revolutionary and you can probably get a career in it. Anything invented after you’re thirty-five is against the natural order of things.” – Douglas Adams
“Word of advice, Jake, never invade Russia. You’ll regret it.” – Outnumbered.
“The third-rate mind is only happy when it is thinking with the majority. The second-rate mind is only happy when it is thinking with the minority. The first-rate mind is only happy when it is thinking.” – A A Milne
“The unread story is not a story; it is little black marks on wood pulp. The reader, reading it, makes it live: a live thing, a story.” – Ursula K Le Guin
“Begin at the beginning and go on till you come to the end; then stop.” – Lewis Carroll