“It is ok to feel negative. In fact it's ok to feel any emotion you are currently experiencing. Experience the negative emotions but don't live them.”
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Ralph Smart 339
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“An occasional foray into negative emotions makes feeling normal that much sweeter.”
Source: Rise of the Evening Star

“Empathy is not a state that is accessible to those who are afraid to feel negative emotion.”

Fourth Lecture, p. 70.
The Psychology of Man's Possible Evolution (1950)
Context: People who think they can control their negative emotions and manifest them when they want to, simply deceive themselves. Negative emotions depend on identification; if identification is destroyed in some particular case, they disappear. The strangest and most fantastic fact about negative emotions is that people actually worship them. I think that, for an ordinary mechanical man, the most difficult thing to realise is that his own and other people's negative emotions, have no value whatever and do not contain anything noble, anything beautiful or anything strong. In reality negative emotions contain nothing but weakness and very often the beginning of hysteria, insanity or crime. The only good thing about them is that, being quite useless and artificially created by imagination and identification, they can be destroyed without any loss. And this is the only chance of escape that man has.

“It's OK to eat fish
'Cos they don't have any feelings”
Something In The Way
Song lyrics, Nevermind (1991)
Variant: It's OK eat fish 'cause they don't have any feelings.