Emptiness

When the meditator forgets himself totally in meditation, it is ‘vishranti’ which means complete relaxation ending in total forgetfulness. This is the blissful state, where there is no need for words, concepts or even the sense of ‘I am’. The state does not know ‘it is’ and is beyond happiness and suffering and altogether beyond words; it is called the ‘Parabrahman’ – a non-experiential state.... Before the emanation of any words, ‘I’ already exist; later I say mentally ‘I am’. The word-free and thought-free state is the ‘atman’.

Sri Nisargadatta Maharaj
The Nectar of Immortality