The Ever Unnameable It – Talk by Ron Sinnige (pdf).
"Zen postulates absolute freedom in which all attachments and restraints are completely wiped away. The Buddha therefore is to be cast away and so are the Patriarchs. Any restraints whatsoever in the mind are to be cast away. For the one who has passed through the abyss of Great Doubt, transcending subject and object, you and I, and has been revived as the True Self, can there be anything to disturb him?"
Zenkei Shibayama, The Gateless Barrier