True humility involves opposites. The truly humble work in silence. Because they do not speak of their accomplishments, credit for them can never be taken away.
The tao that can be told is not the eternal Tao The name that can be named is not the eternal Name. The unnamable is the eternally real. Naming is the origin of all particular things. Free from desire, you realize the mystery. Caught in desire, you see only the manifestations. Yet mystery and manifestations arise from the same source. This source is called darkness. Darkness within darkness. The gateway to all understanding.
When the highest type of people hear Tao (Truth), they diligently practice it. When the average type of people hear Tao, they half believe in it. When the lowest type of people hear Tao, they laugh at it. If they did not laugh, it would not be Tao.
She who is centered in the Tao can go where she wishes, without danger. She perceives the universal harmony, even amid great pain, because she has found peace in her heart. Music or the smell of good cooking may make people stop and enjoy. But words that point to the Tao seem monotonous and without flavor. When you look for it, there is nothing to see. When you listen for it, there is nothing to hear. When you use it, it is inexhaustible.
Seal the openings, shut the doors, and until your last day you will not be exhausted. Widen the openings, interfere, and until your last day you will not be safe.