We can only appreciate beauty if we've also seen ugly.
We can only judge good if we also know evil.
Being and not being define each other. Difficult depends on easy. Long measures short. Low defines high. After follows before.
Concepts are judgements: 7 exists without them. Wisdom is acting only when necessary, not for its own sake. Do not judge the moment, and follow the way of the pattern: Not forcing the future, or dwelling in the past.