Thirty spokes meet in the hub. Where a wheel isn't is where it's useful. Hollowed out, clay makes a pot. Where the pots not is where it's useful. Cut doors and windows to make a room. Where the room isn't, there's room for you. So the profit in what is, is in the use of what isn't.
Words have divided man from woman,
one from another, this from that,
until only sages know how to put things together.
Without words, without even understanding,
lovers find each other.
The moment of finding is always a surprise,
like meeting an old friend never before known.
Having reached a high level of realization (or having accomplished anything in life), don't get excited or puffed up with pride but remain calm, humble, and in "perfect equanimity" if you want to continue in this deep state of consciousness.
Why not simply honor your parents, love your children, help your brothers and sisters, be faithful to your friends, care for your mate with devotion, complete your work cooperatively and joyfully, assume responsibility for problems, practice virtue without first demanding it of others, understand the highest truths yet retain an ordinary manner? That would be true clarity, true simplicity, true mastery.
So sometimes things are ahead and sometimes they are behind; Sometimes breathing is hard, sometimes it comes easily; Sometimes there is strength and sometimes weakness; Sometimes one is up and sometimes down. Therefore the sage avoids extremes, excesses, and complacency.
The superior student listens to the Way and follows it closely. The average student listens to the Way and follows some and some not. The lesser student listens to the Way and laughs out loud. If there were no laughter it would not be the Way.