‘If you do not comprehend the middle way, but see and hear and think and ponder, fixated on the externals of the doctrine, talking about the conduct of the Buddha without applying it in your own mind, that is called having thinking.
Confused people who sit in meditation fanatically trying to get ride of illusion and do not learn kindness, compassion, joyfulness, equanimity, wisdom, and expedient skills, and so are like wood or stone, without any function, are called nonthinking.
Not clinging to the concept of duality is called “neither thinking,” while still consciously seeking noumenon is called “nor non-thinking.”‘ (Commentary on the Diamond Sutra)