From Buddhadasa's essay...
Firstly, consider the point that the Buddha declared that every word that he, the Tathagata, (one who is gone to Suchness), spoke referred to the subject of emptiness. He spoke of no other matter, either directly or indirectly. Any talk unconnected with the subject of emptiness is not the speech of the Tathagata but of disciples of a later time who liked to speak at great length to show how clever and articulate they were.
all things = dhamma
all things = emptiness
dhammas = emptiness
The word "mind" (citta) is being used here in a specific way. Don't confuse it with the 89 cittas or 121 cittas of the Abhidhamma. They are a different matter. That which we call original mind, the mind that is one with panna refers to the mind that is empty of grasping at and clinging to self. Actually, this state shouldn't be called mind at all, it should be called emptiness, but since it has the property of knowing we call it mind. The various schools call it by various names but strictly speaking it's enough to say that the true fundamental nature of mind is satipanna, truth-discerning awareness, absence of grasping and clinging. Thus emptiness lies in perfect panna.
Buddhadasa is very interesting!