1) The document discusses opposing concepts in Taoism such as beauty and ugliness, virtue and vice, being and nothingness. It explains that in Taoism, opposing concepts arise together and depend on one another for their meaning. 2) A key Taoist concept discussed is Wu Wei, which refers to action through inaction, or acting without acting forcibly. The document says sages practice Wu Wei by following the natural way of the Tao and leaving no traces of their deeds. 3) By not taking credit or relying on their accomplishments, sages are able to achieve long-lasting success through Wu Wei, according to the principles of the Tao.