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… You can begin to understand and appreciate emptiness when you realize that it is a necessary component for benefiting from the physical aspect of nature. Whereas you use material objects in your world of form, its functionality can only be created in the space for which it operates. In this way you can realize that importance of the space (emptiness) provided in the wheel hub so that the axle can slide into and turn. Thus the vehicle becomes functional with the turning and connection of the wheel with the axle. When you enjoy your next cup of tea or coffee, consider how the container you drink from can only hold the liquid in the space created by the sides of the container. It is the emptiness in the cup that makes room for the tea or coffee. Functionality is one thing, realizing emptiness as a source is at a deeper level. You may as well start with the cosmos which began with the big bang or so it is theorized. Just before the big bang, there was nothing but emptiness, then “BANG” the universe is unfolding. From emptiness came everything that we know… To attain the Tao, you must become empty from the control of the ego and its incessant thinking and pursuit of sensation seeking and distraction. In this way, the emptiness gives function as spirit. In spirit one aligns with source.
From Section Two, Chapter Twelve, Emptiness As The Source.