  The concept of wu is difficult and has been translated variously as “nothing,” “nothingness,” or “nonbeing.” It marks not only the mystery of Dao but also its limitlessness or inexhaustibility (e.g., ch. 4). Names serve to delimit, to set boundaries; in contrast, Dao is without limits and therefore cannot be captured fully by language. This suggests a positive dimension to transcendence, which brings into view the creative power of Dao: “All things under heaven are born of being (you); being is born of wu” (ch. 40). What does this mean?