No 'I', No Karma

Sri Ramana Maharshi

Is it possible to overcome, even while the body exists, the karma (prarabdha) which is said to last till the end of the body?

Yes. If the agent (doer) upon whom the karma depends, namely the ego, which has come into existence between the body and the Self, merges in its source and loses its form, will the karma which depends upon it alone survive? Therefore when there is no ‘I’ there is no karma. 

As the Self is existence and consciousness, what is the reason for describing it as different from the existent and the non-existent, the sentient and the insentient?

Although the Self is real, as it comprises everything, it does not give room for questions involving duality about its reality or unreality. Therefore it is said to be different from the real and the unreal. Similarly, even though it is consciousness, since there is nothing for it to know or to make itself known to, it is said to be different from the sentient and the insentient.