Many believe the Hua Hu Jing (fourth century BC) was written by Lao Tzu. Although its authorship is contested, the contents of this book are remarkable. Here is a quote:

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The cords of passion and desire weave a binding net around you. Worldly confrontation makes you stiff and inflexible. The trap of duality is tenacious. Bound, rigid, and trapped, you cannot experience liberation. Through dual cultivation it is possible to unravel the net, soften the rigidity, dismantle the trap. Dissolving your yin energy into the source of universal life, attracting the yang energy from that same source, you leave behind individuality and your life becomes pure nature. Free of ego, living naturally, working virtuously, you become filled with inexhaustible vitality and are liberated forever from the cycle of death and rebirth. Understand this if nothing else: spiritual freedom and oneness with the Tao are not randomly bestowed gifts, but the rewards of conscious self-transformation and self-evolution.

The transformation toward eternal life is gradual. The heavy, gross energy of body, mind, and spirit must first be purified and uplifted. When the energy ascends to the subtle level, then self-mastery can be sought. A wise instructor teaches the powerful principles of self-integration only to those who have already achieved a high level of self-purification and self-mastery. In addition, all proper teaching follows the law of energy response: the most effective method is always that to which the student's natural energy most harmoniously responds. For one, celibacy and self-cultivation will be appropriate; for another, properly guided dual cultivation will derive the greatest benefit. A discerning teacher will determine the proper balance of practices for each individual. In any case, know that all teachers and techniques are only transitional: true realization comes from the direct merger of one's being with the divine energy of the Tao.