What Does Hexagram 31, Trạch Sơn Hàm (咸, ䷞), Say About Mutual Attraction Between Two People, and Why Does the Lower Canon Open With This Hexagram?

What is Trạch Sơn Hàm and where does it sit among the 64 hexagrams?

Trạch Sơn Hàm (澤山咸, ䷞) is the thirty-first hexagram of the I Ching in the King Wen sequence, and the first hexagram of the Lower Canon. It consists of the inner trigram Cấn (艮, mountain) below and the outer trigram Đoài (兌, lake) above, so it is also called hexagram Hàm. According to Wikipedia's list of the 64 hexagrams, its Unicode character is U+4DDE (䷞).

The line structure of Hàm is distinctive. Its six yin and yang lines pair in correspondence: Sơ Lục with Cửu Tứ, Lục Nhị with Cửu Ngũ, and Cửu Tam with Thượng Lục. No line stands alone. This is one of the few hexagrams with such perfect pairing, and that structure underpins the hexagram's meaning of mutual attraction.

In the palace classification of the I Ching, Hàm belongs to the Đoài palace. Some sources place it in the Metal phase, reflecting that Đoài is yin Metal; other books record Hàm as Earth because the inner trigram Cấn is yang Earth. This is a point where schools do not fully agree, and this article does not pick one side but records both.

Why does the Lower Canon open with hexagram Hàm?

The Upper Canon opens with Càn and Khôn, heaven and earth, the way of the cosmos. The Lower Canon opens with Hàm and Hằng, attraction and endurance, the way of human beings. According to the Thoán Truyện (Commentary on the Judgment), the character 'Hàm' is 'cảm' (feeling) with the heart radical removed: feeling without selfish intent. Many commentators stress this point, and it is why Hàm is placed at the head of the Lower Canon: every human relationship begins with a selfless stirring, before calculation enters.

The Image text reads: 'Sơn thượng hữu trạch, Hàm; quân tử dĩ hư thụ nhân.' This means: there is a lake on the mountain, that is Hàm; the noble person accordingly keeps the heart empty to receive others. The character 'hư' here does not mean false, but empty, left open. A mountain needs a hollow to hold water; a person needs an empty space in the heart to receive others. This is the foundational lesson of the whole hexagram.

What does the Judgment 'Hàm: hanh, lợi trinh, thủ nữ cát' mean?

The original Chinese text of the hexagram is:

咸：亨，利貞，取女吉。

Sino-Vietnamese reading: Hàm: Hanh, lợi trinh, thủ nữ cát.

Meaning: Hàm means success, favorable to remain steadfast and correct, taking a wife is auspicious. The character 'thủ' here is 'thú', meaning to take a wife. The Judgment is very short, only three clauses, yet it covers both the meaning and the conditions of the hexagram: success if one keeps correct steadfastness, and marriage is a matter suited to the time of Hàm.

Note that the Judgment says 'thủ nữ cát', that taking a wife is auspicious, not that marriage is certainly good in every case. This is the word of the hexagram, not marriage advice for a specific individual. When reading for a person, the hexagram must be placed in that person's concrete situation, not stretched into advice about private life.

The six line texts of Trạch Sơn Hàm and a quick-reference table

The six lines of Hàm use images of stirring in parts of the body to describe six levels of attraction, from the big toe up to the tongue. Read from the bottom up: the Sơ line is at the bottom, the Thượng line at the top.

Sơ Lục: stirring at the big toe

'Hàm kỳ mẫu' means feeling at the big toe. This is the first stage of a connection: a slight noticing, a pleasant greeting, one meeting remembered more than others. Not yet enough to name, only enough to know one is paying attention to this person. The line text neither praises nor blames. In life, this is the moment not to rush to define things, but to let matters unfold naturally for a few days, a few weeks.

Lục Nhị: stirring at the calf

'Hàm kỳ phì, hung, cư cát' means feeling has reached the calf, strong enough to make one want to move. The line text is clear: going brings misfortune, staying still is auspicious. This is the stage of already liking someone and wanting to act first, sending messages in a rush, confessing early, pressing the other person to respond. The hexagram advises pausing a moment, so the other person also has space to stir toward you.

Cửu Tam: stirring at the thigh, following others

'Hàm kỳ cổ, chấp kỳ tuỳ, vãng lận' means feeling at the thigh, following others, going brings regret. The stirring has reached the thigh, almost the whole body wants to go. The line warns: do not follow others to the point of losing yourself. This is the situation of loving someone and forgetting oneself: agreeing to everything, going wherever they go, their opinions becoming your own. The hexagram does not criticize love, only the letting of emotion pull one into a version that is no longer oneself.

Cửu Tứ: restless coming and going

'Trinh cát hối vong, đồng đồng vãng lai, bằng tòng nhĩ tư' means steadfastness brings good fortune and no regret, restless coming and going, friends follow your thoughts. This is the beautiful line and also the most psychologically heavy of the hexagram. The heart has stirred strongly, pacing back and forth, idle thoughts, and each thought drags along a train of imagination and worry. The line advises: keeping the heart upright brings good fortune and ends regret.

One point deserves note at Cửu Tứ. Unlike the other five lines, it does not name a body part. Many commentators read the characters 'đồng đồng' (憧憧) here as tied to the heart, meaning the restlessness is in the heart, not in any other part. This is a point where books do not fully agree, and this article records the common reading as the heart.

Cửu Ngũ: stirring at the flesh behind the heart

'Hàm kỳ mỗi, vô hối' means feeling at the flesh behind the heart, no regret. The fifth line is the line of the deepest and quietest stirring. The character 'mỗi' has two readings: one is the flesh of the back, the other is the area above the heart. The flesh behind the heart is a place few notice, far from the face, far even from the mouth. Stirring here is a feeling that has moved past appearances, needing little speech, little display. The line advises: no regret.

Thượng Lục: stirring left only in the mouth and tongue

'Hàm kỳ phụ giáp thiệt' means feeling at the mouth, jaw and tongue. The last line has stirring left only in the mouth. It sounds good but has no strength left. Fine words, sweet words, promises, all only at the tip of the tongue. This is a warning about the stage when feeling has run dry while words still flow.

The character 'Hàm' without the heart radical: the highlight of the Thoán Truyện

According to the Thoán Truyện, the character 'Hàm' is 'cảm' (感) with the heart radical (心) removed, becoming 咸. It means feeling without selfish intent. Many commentators stress this point, and it is why Hàm is placed at the head of the Lower Canon. If selfish intent enters, attraction turns into calculation, and every relationship becomes hard to sustain.

A clear distinction is needed: the character 'mỗi' in the Cửu Ngũ line has two common readings, one being the flesh of the back, the other the area above the heart. Commentaries differ, so some books record it differently. This article records both readings and does not choose one as the sole standard.

Hexagram Hàm in relation to related hexagrams

When reading a hexagram, one usually also considers the nuclear hexagram, the reversed hexagram and the opposite hexagram. For Trạch Sơn Hàm:

• The nuclear hexagram of Hàm is Thiên Phong Cấu (44), Cấu. The nuclear hexagram shows what lies hidden within the time of Hàm: an unexpected meeting, which may be a new connection but may also be temptation.
• The reversed hexagram of Hàm is Sơn Trạch Tổn (41), Tổn. The reversed hexagram shows the other side of the time of Hàm: loss, a reminder that attraction handled poorly leads to depletion.
• The opposite hexagram of Hàm is Lôi Phong Hằng (32), Hằng. The opposite hexagram shows that Hàm and Hằng go together: Hàm is the first stirring, Hằng is endurance. Without Hàm there is no Hằng, but having Hàm does not guarantee Hằng.

Points where the books do not agree

Three points should be stated clearly so readers are not misled:

First, the phase of the hexagram. Some sources place Hàm in Metal, reflecting that Đoài is yin Metal; other books record Hàm as Earth because the inner trigram Cấn is yang Earth. This article records both.

Second, the Cửu Tứ line. This line does not name a body part. Many commentators read it as the heart, but not every book does. This article records the common reading as the heart while noting that other understandings are possible.

Third, the character 'mỗi' in the Cửu Ngũ line. Some books read it as the flesh of the back, others as the area above the heart. This article records both readings.

In addition, one must distinguish the line texts of the Zhou Yi from the oracle verses of other divination books. The Khổng Minh Thần Toán has verse oracles for each line, such as hexagram 92 Trạch Sơn Hàm with the second line moving and the verse 'Nước sâu bờ rộng dễ đi thuyền, Núi hiểm đàng xa khó hiển nhiên...' This is the oracle verse of another book, not a line text of the Zhou Yi, and must not be mixed in when copying line texts.

Practical lessons of hexagram Hàm

Hexagram Hàm is not marriage advice for any individual. It is the hexagram of first stirring, and its lesson lies in the progression of the six lines: from the very light stirring at the big toe, through the calf, the thigh, to the restlessness in the heart, to the flesh behind the heart, and finally the mouth and tongue. That progression shows that attraction has many levels, and each level has something worth keeping and something worth avoiding.

The Image text teaches 'quân tử dĩ hư thụ nhân': to be felt, one must first open the heart. A rigid person, full of prejudice, full of pride, often has difficulty finding good connections. This lesson applies to all relationships, not only romantic ones.

Finally, remember that hexagram Hàm does not assert absolute fortune or misfortune for every case. The Judgment says 'hanh, lợi trinh, thủ nữ cát', but that is the word of the hexagram in a general context, not a guarantee for any specific individual. When reading for a person, the hexagram must be placed in that person's concrete situation.

The structure of Trạch Sơn Hàm in one table