Sentence:  In his treatment of Zen Buddhism, Abe emphasizes that the true self of Zen Buddhism is dynamic <WSD>śūnyatā</WSD>: "That is to say, true <WSD>Sunyata</WSD> is nothing but the true self and the true self is nothing but true <WSD>Sunyata</WSD>" 
Meaning of the word marked with <WSD> tags:  Emptiness, in terms of a meditative state; an Eastern concept of a high meditative state of calm and freedom from distraction.