It is not that we did not exist in the past, and we are existing at present. That is everyone knows. So in the future, don't think that we may not exist. Na bhavisyamah. It is not that we shall not exist in the future. Na bhavisyamah, not exist, and another not. Two nots make one yes. Two negatives make one positive. So therefore, we have two negatives. Na caiva na bhavisyamah. Na bhavisyamah means not to exist in the future; that is not. That means we shall exist. Na caiva na bhavisyamah sarve... all of us. All of us, you, not that "Because I am God, because you are My friend, God's friend, and all others..." No, everyone. This is knowledge.
Lecture on Bhagavad-gita 2.12, London 18 August, 1973