The Ideals of Nirvana

Nirvana has been defined as complete freedom from illusion, hatred, and greedy desires-how might this ideal be useful to you/us?
Nirvana is defined by the most as a state of mind in which one reaches "enlightenment". However to contradict that statement, no one really knows what true enlightenment feels like due to everyone not knowing if the other person claiming Nirvana has really experienced it, or is only thinking he has experienced it and is spreading false information about his triumph and what it feels like.
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