I am hopeful that I will attain Anatta. After I attain Anatta I will cease to be expressible. That hope motivates me to give up the clinging to forms, feeling , perception , consciousness etc... But what about the clinging to the hope of getting Nirvana...? Should I give up hope of getting Nirvana in order to achieve Anatta or Nirvana ?
Your question reminds me of this sutta, when Buddha told monks it is normal for oldest prince born from a great king and rightful queen. He is from righteous blood line 7 generations up, endowed with physical strength and intelligence. It is only normal for him to expect to inherit the throne when time comes. So do monks who has 7 factors for enlightenment. It isn't unusual for them to expect nirvana. I don't believe Buddha said anything about how to deal with the "hope/expectation", as long as you have 7 factors of enlightenment
again, i maybe someone with better memories than me could help me recall referencing sutta number. thanks.