Knowing the Masculine, Keeping to the Feminine
This chapter presents strength as something to hold in reserve rather than perform, using deliberately paired opposites — male and female, white and black, honor and disgrace — to describe a posture of receptive power.
The chapter's structure is a triad, each part following the same pattern: know the masculine, keep to the feminine, and become the ravine of the world (為天下谿); know the white, keep to the black, and become the model of the world; know honor, keep to disgrace, and become the valley of the world. In each case, becoming the "ravine" or "valley" means occupying the low, receiving position where everything eventually flows and gathers, rather than the high, assertive one. Laozi then says that whoever becomes the valley of the world will have constant virtue (常德) that does not leave, and returns to the state of the uncarved block (樸). The chapter closes on a political point: when the uncarved block is cut apart it becomes tools and vessels, and the sage, using these, becomes chief of officials — governance works best when it uses what has been shaped without itself losing the uncut wholeness it governs from.
Know the masculine, keep to the feminine, and be the ravine of the world.
Tao Te Ching