Same as 'irrational fears are scary despite being irrational', or 'imaginary fears are scary despite being imaginary'.
We can imagine other people's pain, however, or hypothetical pain, and that is not the same as experiencing pain itself.
By the same logic, I can feel happy just by imagining myself feeling happy?
Responding to your edit:
>whether there is even a difference between feeling happy and “being” happy.
That's not the question. The question is whether there's a difference between feeling happy and imagining yourself feeling happy.
If you answer, well laughter is physical while pain is mental, then I will ask you how that is a genuine dichotomy. The mental representation of unexperienced pain is also, in truth, a physical phenomenon since the mind is a physical experience, but the mental representation of pain is not the same as experienced pain.
But pain or pleasure, sadness or happiness from some imagined event, yes, that's real and it's what the original sentence intended to say, I believe.
Edit: This was meant as a reply to addicted rather than foldr...
However, I get that the most effective torture doesn't rely on actual physical pain. The worst thing is the knowledge that one is being permanently disfigured. And that's all about imagining the future.
This statement confuses cause (some damage) and effect (pain) and so should be in the bullshit category, or else it's poorly written/translated.
An imagined cause may lead to real pain, for example if you believe you've been betrayed but you haven't. The pain is the same as if you had actually been betrayed, and in both cases that pain isn't imagined, it's a real mental, neurological phenomenon.
But the only pain that's imagined is pain that's not happening to us, like someone else's pain and future pain, and sorry but despite all sympathy and fear, yeah that does usually hurt a lot less.