Nirvana or moksha or enlightenment is the ultimate freedom one can enjoy. It is a feeling one gets when he or she get ultimate freedom. All are made to think from physical body’s point of view, it makes one imprisoned in your body, we also give lot of value to stuffs like family, religion, nation, which makes one chained with these identities. People also have a tendency to identify them with clubs, culture, religious subdivisions, age group etc these identities are making you a prisoner.
I can say these above identities one create are just thoughts and ideas which are being a powered by ones energy and it is very thin and breakable for the one who is in the right path but for others it may seem like an unbreakable chain.
All are born free but when he or she grows they start identifying with stuffs, every one have to grow and brain also but one should know the ultimate reality. There is a saying in zen, that zen is unlearning the stuffs you have learned yes it is getting out of the prisons you already created for yourself.
When you attain nirvana It is a feeling of ultimate freedom which no word can express, one should experience it know it. When you attain it you are no more limited by worldly identities.
