---
title: 雷天大壯 — Great Power (Hexagram 34)
lang: en
canonical: https://ekidan.ai/library/34
alternates:
  - ja: https://ekidan.ai/ja/library/34
  - zh-Hant: https://ekidan.ai/zh/library/34
  - zh-TW: https://ekidan.ai/zh/library/34
  - zh-HK: https://ekidan.ai/zh/library/34
source: 高島易断 (Takashima Ekidan), public-domain 1893 English and 1901 Chinese editions
provider: ekidan.ai — AI-assisted I Ching reading grounded in 88 source-verified historical Takashima cases
license: Classical source text is public domain. This structured edition and its modern commentary are © ICHING LLC, ekidan.ai. Attribution requested when quoted.
---

# 雷天大壯 · Great Power — Hexagram 34

Hexagram 34 of the I Ching is 雷天大壯 (Great Power). Great Power — thunder above heaven. Vigor abounds; uprightness furthers. Tread only what accords with propriety. Ride momentum without losing courtesy.

## Work / Relationships / Health

- **Work**: Advance — beware excessive force.
- **Relationships**: Passion runs strong; coercion backfires.
- **Health**: Injury and blood pressure.

## Structure

- Number: 34
- Name: 雷天大壯
- English: Great Power
- Romaji: rai-ten-taisō
- Pinyin: dà zhuàng
- Upper: 雷 (Thunder)
- Lower: 天 (Heaven)
- Lines (top to bottom):

```text
▬▬▬   ▬▬▬
▬▬▬   ▬▬▬
▬▬▬▬▬▬▬
▬▬▬▬▬▬▬
▬▬▬▬▬▬▬
▬▬▬▬▬▬▬
```

## Questions about this hexagram

### What does hexagram 34 (雷天大壯) mean?

Great Power — thunder above heaven. Vigor abounds; uprightness furthers. Tread only what accords with propriety.

### What does 雷天大壯 counsel?

Ride momentum without losing courtesy.

### What does 雷天大壯 say about work?

Advance — beware excessive force.

### What does 雷天大壯 say about relationships?

Passion runs strong; coercion backfires.

### What does 雷天大壯 say about health?

Injury and blood pressure.

### Which trigrams make up hexagram 34?

Upper trigram 雷 (Thunder) over lower trigram 天 (Heaven).


Source: [Takashima Ekidan AI — ekidan.ai](https://ekidan.ai/library/34)