It is a condition of the wakeful and dream phases of human existence that thoughts should flow through the human consciousness. For they are the active phases of the divine entity wherein it is incessantly creative. Only in the negative phase of deep sleep can thoughts be absent. This is the normal truth. For in a fourth phase, attainable through intense self-absorbed meditation and for a brief interval only, the thought-free state can be induced without any loss of awareness.
-- Notebooks Category 19: The Reign of Relativity > Chapter 3: The States of Consciousness > # 178