When both cease to be, how can the unity subsist?

"There is no more a unity than there is duality; relative and absolute are names of the nameless. Zen, that is to say, is a word that is used like an algebraic sign, for all that is nameless, all that escapes thought, definition, explanation, yet breathes through words and silence; is communicated in spite of our best efforts to communicate it.

"Actions are either good or bad; yet nothing is good or bad, but thinking makes it so. That is to say, things are both good or bad and neither; relative and absolute; or, if you wish it, neither relative nor absolute, there is neither duality nor a unity."