"Sayable" is one dimension of expressible thought;"unsayable" expresses what is not "sayable" dimension of thought.

"可说"是语达思的一个度,"不可说"达"可说"思的其他度。"

"Sayable" is a relatively closed system of expressions, and "unsayable" is a relatively open one.

可说"是相对封闭性的系统,"不可说"是相对开放性的系统。"