The I Ching (Yijing) — The Small Teaching (5-minute overview)

What it is. The Yijing — the "Classic of Changes" — is one of the oldest books still in use: a manual of sixty-four six-line figures called hexagrams, each with brief oracular texts, wrapped in ancient commentaries called the Ten Wings. China counts it among the Five Classics. For three thousand years it has served two masters at once: a wisdom book about how things change, and an oracle — you put a sincere question to it, cast lots, and read the figure that falls as a mirror of your situation. Its core, the Zhouyi, comes from the early Zhou period, before Confucius; the commentaries were added centuries later 1.

Two stories, held apart. The traditional story: the sage Fu Xi drew the eight trigrams; King Wen of Zhou, imprisoned by a tyrant, wrote a short judgment on each hexagram; his son the Duke of Zhou wrote the line texts; Confucius wrote the Ten Wings. The scholarly story: Fu Xi is legendary; the Text is far older than the commentaries; and the Wings bear no signature of Confucius — the Great Treatise, their philosophical heart, is "evidently" not his 1. The first is how the book has been read for two thousand years; the second is, as far as evidence reaches, how it was made.

The map — five things to grasp

1. Yin and yang. Every figure is built from two kinds of line: the unbroken line (yang) and the broken line (yin). The oldest vocabulary called them simply "strong" and "weak"; the names yin and yang come from the later commentaries 1. Everything the book says is a statement about how these two forces combine, alternate, and trade places — which is why the book is called Changes.

2. Eight trigrams, sixty-four hexagrams. The eight three-line figures — Heaven, Earth, Thunder, Wind, Water, Fire, Mountain, Lake — stack in pairs to make sixty-four hexagrams (eight times eight). Each names a situation — the Creative, the Receptive, Waiting, Conflict, Peace, the Well, Revolution, and finally After Completion and Before Completion. The book stops at sixty-four for a practical reason: more figures, Legge observed, would have been too cumbrous to interpret "after the manner of King Wen" 1.

3. Four voices in every hexagram. The Judgment — the verdict on the situation ("The Creative: great and originating, penetrating, advantageous, correct and firm"). The line texts — the Duke of Zhou's sentence for each of the six positions, bottom-up (in the Creative: a dragon hidden, appearing, flying, overreaching). The Image — the commentary's emblem turned into counsel ("Heaven, in its motion, gives the idea of strength. The superior man nerves himself to ceaseless activity"). And the moving lines — lines "old" enough to flip into their opposite, turning your hexagram into a second one: where the situation is heading 1.

4. How consultation works. Form a sincere, specific question; build six lines bottom-up by casting lots. The classical method works forty-nine yarrow stalks through eighteen manipulations, as the Great Treatise describes; later ages simplified it to three coins tossed six times. Read the Judgment, the Image, and any moving lines. The result is counsel, not command.

5. What the book is for. The tradition's own account is strikingly modest. Legge concluded from the ancient sources that consulting the book "was not to discover future events absolutely... but to ascertain whether certain schemes, and conditions of events contemplated by the consulter, would turn out luckily or unluckily" 1. Read that way — as structured reflection on a decision — the Yijing needs no supernatural claim to repay study. A skeptic inside the tradition put it more sharply: "The divining stalks are so much withered grass; the tortoise-shell is a withered bone... Why not listen to yourself instead of seeking to learn from things?" 1.

One honest note on where this comes from. The Yijing survived the First Emperor's burning of the books (213 BCE) as a classed divination manual — an exempt category 1. It reached the West in a Jesuit Latin version (Régis, ed. Mohl, 1834) 2, then in James Legge's complete 1882 English translation — the scholarly public-domain source these teachings distill 1. The famous Wilhelm/Baynes version with Jung's foreword (1950) is the modern gateway to the book but lies outside our public-domain sources, treated here at arm's length.

Go deeper: deep.md is the eight-lesson course: trigrams, casting, and reading a hexagram. ultra-deep.md gives the full textual history — the Zhouyi core versus the Ten Wings, Wang Bi's commentary revolution, the hexagrams as a philosophy of change, the Western reception — with an annotated bibliography of the sources.

Sources

• 1 — The Yi King (Sacred Books of the East, vol. 16), translated by James Legge, Oxford 1882 — English. The complete Text, the Ten Wings, and Legge's critical introduction: the Tier-0 source for these teachings.
• 3 — The Chinese original (64 hexagrams with judgments and line statements plus the Ten Wings) — Chinese. Used to verify the canonical sequence and the structure of the Wings.
• 2 — Y-king, antiquissimus Sinarum liber, from the Jesuit Latin of P. Régis, edited by Julius Mohl, 1834 — Latin. The first Western translation.
• 4 — Le Yi: King, translated by P.-L.-F. Philastre, Paris 1885 — French. The first French translation from the Chinese.