王期見，秦昭王問道焉，曰：「寡人聞客食陰以為動強，翕（吸）氣以為精明。（寡）人何處而壽可長？」王期合（答）曰：「必朝日月而翕（吸）其精光，食松柏，飲走獸泉英，可以?老复莊（壯），曼澤有光。夏三月去火，以日爨享（烹），則神慧而?（聰）明。椄（接）陰之道，以靜為強，平心如水，靈路（露）內臧（藏），款以玉筴（策），心毋秫（怵）?（盪），五音進合（答），孰短孰長，翕（吸）其神?（霧），飲夫天將（漿），致之五臧（藏），欲其深臧（藏）。蠪（龍）息以晨，氣刑（形）乃剛，襄□□□，□□近水，精氣凌楗（健）久長。神和內得，雲（魂）柏（魄）皇□，五臧（藏）?（固）白（薄），玉色重光，壽參日月，為天地英。」昭王曰：「善。」

 

During an audience with Wang Qi[1], King Zhao of Qin[2] questioned him about his methods, saying, "We have heard that you believe consuming yin[3] energy makes you stronger and that inhaling qi refines your jing. How can we extend our lifespan in this way?"

Wang Qi answered, "Every morning it is necessary to breathe deeply, eat pine and cypress[4], drink milk or soup made of the genitals of male animals, and thus you will remain virile into your old age and remain radiantly attractive. To cool down during the three months of summer use the sunlight for cooking[5], and you will grow intelligent and perceptive. The way to absorb yin energy[6] is to remain strong and silent, your spirit like still water, allowing no dissipation of your vital forces. After penetration, when the spirit is untroubled, the five sounds[7] proceed harmoniously one after the other, allowing you to assess the response, inhale the subtle vapours and drink the heavenly elixir. These attain the five organs, seeking out the depths of the viscera. Exhale like a dragon in the morning (...)  Your jing and qi will be purified and fortified, and your life long. Your spirit will be at peace and your soul magnificent. Your five organs will be (...) glowing intensely like jade, living as long as the sun and moon, outstanding in earth and heaven." 
King Zhao said, "Very well."

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[1] This person is not otherwise well-known.

[2] King Zhaoxiang of Qin (306–251 BC) began life as a relatively minor prince, and served as a child hostage in Zhao before being sneaked out by Queen Xuan (his mother), her brother Wei Ran, and King Wuling of Zhao to assume the throne following the premature death of his brother, King Wu. Upon coming of age, he exiled Queen Xuan and Wei Ran, and worked with a succession of important figures of the age (Gan Mao, Fan Ju, Bai Qi...) to expand Qin's territory during the course of a long and successful reign.

[3] By this point these were technical terms, so I am merely transliterating them. Yin refers to female sexual energy and was believed to make men stronger when consumed. Qi refers to internal life force as well as human breath, and jing to potency in the abstract sense as well as seminal fluid.

[4] This may just refer to foods traditionally considered "clean".

[5] This may mean cooking using a parabolic mirror, or eating raw food, a traditional cure for "heatiness" in Chinese medicine.

[6] I.e. having sex with women during which they reach orgasm but he does not (or ejaculates "backwards"). 

[7] Noises made by women during sex, taken to indicate their relative level of excitement.