Nirvana

Patient : Sir, I think I have lost my mind.
Doctor : Oh, how you can be so careless! Isn't mind a valuable asset to you?
Patient: Oh, sir, what shall I do now?
Doctor : I shall suggest you to go for mind transplantation.
Patient : How I can get a donor for that?
Doctor : Go to a library. Choose a book, seat for reading, if you see the book, it's not your book, if you see the alphabets still it's not your book, but if you lost yourself in the book, it's your book.
Patient: But what will happen if I don't find any book like that!
Doctor: Then I shall give you my heartiest congratulations, you have achieved Nirvana already, just relax and enjoy the mindless life in this maddening world.