Knowledge is dangerous, which is why governments often clamp down on people who can think thoughts above a certain caliber.
Interpretation
Knowledge can be threatening to authority, leading to suppression of critical thinking.
This quote by Terry Pratchett reflects the idea that knowledge and the ability to think critically are seen as a threat by governments, leading them to suppress those who challenge their authority or conventional thinking. It suggests that when individuals possess a higher caliber of thought, they may question the status quo, which can make those in power uncomfortable or fearful.
In practice
In a speech about freedom of expression, this quote illustrates the risks associated with knowledge.
And then Jack chopped down what was the world's last beanstalk, adding murder and ecological terrorism to the theft, enticement, and trespass charges already mentioned, and all the giant's children didn't have a daddy anymore. But he got away with it and lived happily ever after, without so much as a guilty twinge about what he had done...which proves that you can be excused for just about anything if you are a hero, because no one asks inconvenient questions.
They've got something they do it with, I think it's called a mocracy, and it means everyone in the whole country can say who the new Tyrant is. One man ... one vet. ... Everyone has ... the vet. Except for women, of course. And children. And criminals. And slaves. And stupid people. And people of foreign extraction. And people disapproved of for, er, various reasons. And lots of other people. But everyone apart from them. It's a very enlightened civilization.
Geography is just physics slowed down, with a couple of trees stuck in it.
You can't trample infidels when you're a tortoise. I mean, all you could do is give them a meaningful look.
Any fool could be a witch with a runic knife, but it took skill to be one with an apple corer.
People look down on stuff like geography and meteorology, and not only because they're standing on one and being soaked by the other. They don't look quite like real science. But geography is only physics slowed down and with a few trees stuck on it, and meteorology is full of excitingly fashionable chaos and complexity. And summer isn't a time. It's a place as well. Summer is a moving creature and likes to go south for the winter.
Out of Ireland have we come, great hatred, little room, maimed us at the start. I carry from my mother's womb a fanatic heart.
And I have by me, for my comfort, two strange white flowers - shriveled now, and brown and flat and brittle - to witness that even when mind and strength had gone, gratitude and a mutual tenderness still lived on in the heart of men.
But the most obvious fact about praise β whether of God or anything β strangely escaped me. I thought of it in terms of compliment, approval, or the giving of honor. I had never noticed that all enjoyment spontaneously overflows into praise unless (sometimes even if) shyness or the fear of boring others is deliberately brought in to check it.
I never liked the idea of doing what a machine says. I hate having to salute something built in a factory.
Laws are not masters but servants, and he rules them who obey them.
Each reader reads only what is already within himself. The book is only a sort of optical instrument which the writer offers to the reader to enable the latter to discover in himself what he would not have found but for the aid of the book.
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