When the emptying of the mind is made the goal of the mind, then it is not really emptied even if this seems to occur. The unexpressed goal is also present, even though unthought during the time of the void. In short it is not a genuine, authentic emptiness. Yet this is the sort of thing that happens in most yogic circles. Only a philosophically informed mind can reach the real void.
-- Notebooks Category 23: Advanced Contemplation > Chapter 7: Contemplative Stillness > # 150