Nourishment
頤 · Yí
What you put in the mouth and what comes out of it. Mountain above Thunder — the vessel of self-cultivation. Watch what you consume and what you produce; both determine what you become.
Correspondences
The Good Shepherd — He Leaves the 99
The most memorized passage in Western Christianity: 'The Lord is my shepherd; I shall not want. He makes me lie down in green pastures. He leads me beside still waters. He restores my soul' (Psalm 23:1-3). A thousand years later Jesus claims to be that shepherd: 'I am the good shepherd. The good shepherd lays down his life for the sheep' (John 10:11). And then the parable: which of you, having a hundred sheep and losing one, does not leave the ninety-nine and go after the lost one until he finds it? (Luke 15:4). The math doesn't make sense unless the one lost sheep matters absolutely. The testimony structure of the Gospel begins here — every person is the lost sheep, and the Gospel claim is that the Shepherd came looking before you knew you were lost. 'I was found by one who did not seek me' (Romans 10:20, quoting Isaiah). Psalm 23 ends where every testimony ends: 'Surely goodness and mercy shall follow me all the days of my life.'
Yí (頤) — Nourishment
Mountain above Thunder — the mouth, what enters it and what comes out of it. "Watch what you take in; seek your own nourishment." Both dimensions matter equally: the quality of what you consume and the quality of what you produce. The cauldron of the self is shaped by what passes through it. This extends past food — what you attend to, what you repeat, what you spend your days making.
Inner Alchemy (Neidan): Building the Foundation (Zhù Jī 築基)
Zhù Jī (築基) is the preliminary stage of Neidan (internal alchemy) in which the practitioner stabilizes the body-mind through regulation of diet, sleep, breath, and sexual energy. The body is treated as the alchemical laboratory — the furnace (lú 爐) and the cauldron (dǐng 鼎) must be prepared before any transmutation of the Three Treasures (sān bǎo: jing, qi, shen) can begin. Daoist texts such as the Cantong Qi and later Quanzhen manuals insist that without this foundation, attempts at higher refinement scatter the practitioner's qi rather than consolidate it.
Thunder (☳) — Arousing
One yang line beneath two yin — force erupting upward, the shock that initiates movement. Thunder is the eldest son, the arousing principle, the first spring thunder that breaks winter's stillness. It appears in fifteen hexagrams, carrying qualities of initiative, shock, and the energy that sets things in motion. Its associated season is spring; its direction is east; its nature is movement that cannot be stopped once it begins.
Mountain (☶) — Keeping Still
Two yin lines beneath one yang — stillness, boundary, the place where movement ceases. Mountain is the youngest son, the principle of stopping, the quality of knowing when not to continue. It appears in fifteen hexagrams, carrying qualities of rest, contemplation, and the strength required to remain unmoved. The mountain doesn't resist — it simply is what it is, and everything encounters it on those terms.