Master Bankei's word for the ultimate reality is the Unborn (in japanese fusho) and those who are illumined or enlightened (have experienced what in ZEN is called satori), like the Taoist Sages, manifest pure spontaneity. Bankei describes to an acquaintance who was a devotee of the Martial Arts what it would be like to fight after satori: "When without thinking and without acting deliberately, you manifest the Unborn, you won't have any fixed form. When you are without fixed form, no opponent will exist for you in the whole land. Not holding on to anything, not relying one-sidedly on anything, there is no 'you' and 'no enemy'. Whatever comes you just respond, with no traces left behind."
Master Bankei teaches us that to not react but to respond is the ultimate action of inaction. To change with every situation and not be bound to a fixed system. (Much like the ways in Bruce Lee's Jeet-Kune-Do)
Master Bankei says: "The Sage has no ego and so does not deliberate. What the Sage does is to respond with Absolute Sponianeity to the conditions in the world."