Chinese medical theory believes that the human organism is built to live 100 years. According to the first chapter of the Nei Jing, the premier classic of Chinse medicine, most people have enough jing essence to last 5 score years. Barring accidental death or infectious disease, we are designed to last 100 years as long as former heaven essence is not squandered by excessive consumption and as long as latter heaven or acquired essence is manufactured and stored to bolster and slow the use of former heaven essence. Since latter heaven essence is manufactured from the food and drink we ingest, it is no wonder that Chinese medical theory places such great importance on proper diet and promoting good digestion. Likewise, since acquired essence is stored in the kidneys at night when we sleep, it is no wonder why proper rest and sleep are important as well.
Former heaven essence is like a patrimony or trust fund we inherent at birth. Latter heaven essence is like money which we save in the bank. It is that part of our daily economy above and beyond our operating expenses. When we store it as acquired jing essence, it and our former heaven essence together become our body's capital. It is said in alchemy that it takes gold to make gold and that the more gold one has, the more one can make. When applied to our inner alchemy, our original gold is our jing essence, both former and latter heaven. When these two essences are full and abundant, organ function is strong, metabolism is efficient, and we generate a profit each day. Therefore, it takes jing to make jing and the more jing we have, the more we can make. When we age, however, instead of living on our interest, we run a negative daily balance and are forced to dip into our capital. Eventually we consume all our capital and we go bankrupt or die.
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