You begin to understand emptiness when you cut out preconceptions.

If you believe shunyata is a tremendous expanse, discard this idea.

If you believe in mind, or that everything is mind-created, or that there is some foundation or substance, throw away such a concept.

Unmask everything and let your mind become totally silent, peaceful, empty, and clear: let it become the experience of shunyata.

Within this clear and empty space between thoughts, before another concept forms, there is no subject, no object, and no experience.

Here is the nature of enlightenment. 

Hidden Mind of Freedom