There are changes in experience that you can bring about through intentional changes in the mind and body, by way of faculties such as attention, perception, imagination, abstraction and reasoning that are in some degree under control, and these changes are in a broad sense predictable, not in detail certainly, but as defining a sort of experiential space of several dimensions but with its own underlying stability. It is the space of human experience, more or less communicable. It is the kind of thing that an introspective psychology attempts to map out, and although known through the kinds of objects that are met with it it also reflexively maps out a range of possible subjects, which again allows you to infer certain even broader limits of experience for the speculative imagination. There is an economy of sorts in this, a certain subtly defined give and take between objective and subjective poles, which is also felt to be a limitation. As soon as this is grasped there is a striving to break the bounds imposed by such an economy, and the most obvious ways to do this are via sex and drugs and what might be called the numinous. These are ways of altering or temporarily shattering the economy of experience by going beyond anything that can be positively willed, predicted or prescribed. You exceed the tolerances of the vehicle, selectively overload it, break it down, but in doing so you discover that you cannot break the silent experiencer which is thoroughly without limits. It doesn't ask for more, it is simply and neutrally adequate to every extension, every trespass on the agreed terms. Your economies of experience, no matter how far you extend them, remain in this sense limited economies in relation to the subject you truly are which is the infinite openness of a general economy.