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昔者，黄帝将甲子分轻重而配成六十，号曰花甲子，其花字诚为奥妙，圣人借意而喻之，不可着意执泥。夫自子至亥十二宫，各有金、木、水、火、土之属，始起于子为一阳，终于亥为六阴，其五行所属金、木、水、火、土，在天为五星，于地为五岳，于德为五常，于人为五脏，其于命也为五行。是故甲子之属乃应之于命，命则一世之事。故甲子纳音象，圣人喻之，亦如人一世之事也。何言乎？子丑二位，阴阳始孕，人在胞胎，物藏根，未有涯际；寅卯二位，阴阳渐开，人渐生长，物以拆甲，群葩渐剖，如人将有立身也；辰巳二位，阴阳气盛，物当华秀，如人三十、四十而有立身之地，始有进取之象；午未二位，阴阳彰露，物已成齐，人至五十、六十，富贵贫贱可知，凡百兴衰可见；申酉二位，阴阳肃杀，物已收成，人已龟缩，各得其静矣；戌亥二位，阴阳闭塞，物气归根，人当休息，各有归着。详此十有二位先后，六十甲子可以次第而晓。
甲子乙丑何以取象为海中之金？盖气在包藏，有名无形，犹人之在母腹也；壬寅癸卯绝地存金，气尚柔弱，薄若缯缟，故曰金泊金；庚辰辛巳以金居火土之地，气已发生，金尚在矿，寄形生养之乡，受西方之正色，乃曰白蜡金；甲午乙未则气已成，物质自坚实，混于沙而别于沙，居于火而炼于火，乃曰沙中金也；壬申癸酉气盛物极，当施收敛之功，颖脱锋锐之刃。盖申酉金之正位，干值壬癸，金水淬砺，故取象剑锋而金之功用极矣；至戌亥则金气藏伏，形体已残，锻炼首饰，已成其状，藏之闺阁，无所施为，而金之功用毕，故曰庚戌辛亥钗钏金。壬子癸丑何以取象桑柘木？盖气居盘屈，形状未伸，居于水地，蚕衰之月，桑柘受气，取其时之生也；庚寅辛卯则气已乘阳，得栽培之势力其为状也，奈居金下，凡金与霜素坚，木居下得其旺，岁寒后凋，取其性之坚也，故曰松柏木；戊辰己巳则气不成量，物已及时，枝叶茂盛，郁然成林，取其木之盛也，故曰大林木；壬午癸未，木至午而死，至未而墓，故杨柳盛夏叶凋，枝干微弱，取其性之柔也，故曰杨柳木；庚申辛酉，五行属金而纳音属木，以相克取之。盖木性辛者，唯石榴木；申酉气归静肃，物渐成实，木居金地，其味成辛，故曰石榴木；观他木至午而死，惟此木至午而旺，取其性之偏也。戊戌己亥，气归藏伏，阴阳闭塞，木气归根，伏乎土中，故曰平地木也。丙子丁丑何以取象涧下水？盖气未通济，高段非水流之所，卑湿乃水就之乡，由地中行，故曰涧下水；甲寅乙卯，气出阳明，水势恃源，东流滔注，其势浸大，故曰大溪水；壬辰癸巳，势极东南，气傍离宫，火明势盛，水得归库，盈科后进，乃曰长流水也；丙午丁未，气当升降，在高明火位，有水沛然作霖，以济火中之水，惟天上乃有，故曰天河水；甲申乙酉，气息安静，子母同位，出而不穷，汲而不竭，乃曰井泉水；壬戌癸亥，天门之地，气归闭塞，水历遍而不趋，势归乎宁谧之位，来之不穷，纳之不溢，乃曰大海水也。戊子己丑何以取象霹雳火？盖气在一阳，形居水位，水中之火，非神龙则无，故曰霹雳火；丙寅丁卯，气渐发辉，因薪而显，阴阳为治，天地为炉，乃曰炉中火也；甲辰乙巳，气形盛地，势定高冈，传明继晦，子母相承，乃曰覆灯火也；戊午己未，气过阳宫，重离相会，炳灵交光，发辉炎上，乃曰天上火也；丙申丁酉，气息形藏，势力韬光，龟缩兑位，力微体弱，明不及远，乃曰山下火也；甲戌乙亥谓之山头火者，山乃藏形，头乃投光，内明外暗，隐而不显，飞光投干，归于休息之中，故曰山头火也。庚子辛丑何以取象壁上土？气居闭塞，物尚包藏，掩形遮体，内外不交，故曰壁上土；戊寅己卯，气能成物，功以育物，发乎根，壮乎萼蕊，乃曰城头土也；丙辰丁巳，气以承阳，发生已过，成齐未来，乃曰沙中土也；庚午辛未，气当承形，物以路彰，有形可质，有物可彰，乃曰路傍土也；戊申己酉，气以归息，物当收敛，龟缩退闲，美而无事，乃曰大驿土也；丙戌丁亥，气成物府，事以美圆，阴阳历遍，势得其间，乃曰屋上土也。
余见路旁之土播殖百谷，午未之地，其盛夏长养之时乎？大驿之土通达四方，申酉之地，其得朋利亨之理乎？城头之土取堤防之功，五公恃之，立国而卫民也；壁上之土明粉饰之用，臣庶资之，爰居而爰处也；沙中之土，土之最润者也，土润则生，故成齐未来而有用；屋上之土，土之成功者也，成功者静，故止于一定而不迁。盖居五行之中，行负载之令，主养育之权，三才五行皆不可失；处高下而得位，居四季而有功。金得之锋锐雄刚，火得之光明照耀，木得之英华越秀，水得之滥波不泛，土得之稼穑愈丰。聚之不散，必能为山，山者，高也；散之不聚，必能为地，地者，原也。用之无穷，生之罔极，土之功用大矣哉！五行取象，皆以对待而分阴阳，即始终而明变化。如甲子乙丑对甲午乙未，海中沙中，水土之辨，阴阳之分也；壬寅癸卯对壬申癸酉，金泊剑锋，金木之辨，刚柔之别也；庚辰辛已对庚戌辛亥，白蜡钗钏，干巽异方，形色各尽也；壬子癸酉对壬午癸未，桑柘杨柳，一曲一柔，形质多别也；庚寅辛卯对庚申辛酉，松柏石榴，一坚一辛，性味迥异也；戊辰己巳对戊戌己亥，大林平地，一盛一衰，巽干殊方也；戊子己丑对戊午己未，霹雳天上，雷霆挥鞭，日月同照也；丙寅丁卯对丙申丁酉，炉中山下，火盛木焚，金旺火灭也；甲辰乙巳对甲戌乙亥，覆灯山头，含光畏风，投光止艮也；庚子辛丑对庚午辛未，壁上路旁，形分聚散，类别死生也；戊寅己卯对戊申己酉，城头大驿，东南西北，坤艮正位也；丙辰丁巳对丙戌丁亥，沙中屋上，干湿互用，变化始终也。
圆看方看，不外旺相死休；因近取远，莫逃金木水火土。以干支而分配五行，论阴阳而大明终始。天成人力相兼，生旺死绝并类。呜呼！六十甲子圣人不过借其象以明其理，而五行性情、材质、形色、功用无不曲尽而造化无余蕴矣。
The ancients combined the sixty Jia Zi (Heavenly Stems and Earthly Branches) with the Five Elements to form "Na Yin Symbolism," using natural evolution as a metaphor for the developmental cycles of human life. The twelve Earthly Branches correspond to different life stages: Zi and Chou resemble a fetus 🌱 hidden in the mother's womb; Yin and Mao are like a young sprout just beginning to grow 🌿; Chen and Si represent the enterprising prime of life ⛰️; Wu and Wei show the rise and decline of maturity 🌞; Shen and You signify the gathering and settling of old age 🍂; Xu and Hai return to stillness and rest 🌙. The Na Yin attributes of each stem-branch pair (such as "Gold in the Sea," "Willow Wood," etc.) all stem from the energy state of the Five Elements at specific stages, revealing the patterns of development in all things.
Na Yin Five Elements is a dynamic model that uses natural imagery (gold ore, streams, thunder, etc.) to depict the evolving forms of Five Elements energy across time and space, reflecting the characteristics of various life stages.
Developmental Cycle Theory:
| Earthly Branch Stage | Life Stage | Modern Equivalent |
|---|---|---|
| Zi & Chou | Gestation Period | Career/Academic Preparation |
| Yin & Mao | Initial Growth | New Professional/Startup Phase |
| Chen & Si | Energy Explosion Period🔥 | Peak Career Years (30-40) |
| Wu & Wei | Stability & Divergence | Achievement Consolidation (50-60) |
| Shen & You | Gathering & Settling | Retirement Planning Phase |
| Xu & Hai | Rest & Repose | Later Years in Life |
Essence of Na Yin Attributes:
The Na Yin system reveals the law of energy conservation:
The essence of ancient texts: Na Yin is a symbolic natural philosophy. Its value lies not in predictive accuracy but in providing a thinking framework for observing the laws of evolution in all things. Contemporary applications should strip away mystical elements and focus on its systems thinking and cyclical cognitive model.