>No other animal has such a conception.

Tell me your secret to understanding the inner minds of animals.

Seriously, any pet owner will tell you animals seemingly have feelings. They do things that don't make much sense outside of them showing love, hate, annoyance, etc. It's not scientific, but why would humans be so different from animals when we all came down a similar evolutionary line? You don't see great leaps in physical trait happening, usually, it's a gradual process, so I would assume that feelings gradually developed into what humans have now.