Yi Jing, Oracle of the Moon

Zhèn-Gěn, Thunder-Mountain
    

  When Zhèn becomes Gěn, there is thunder in the mountains, long far rumbling. Mountain tames Thunder's impulsiveness, but together their voices reach far. When those two forces support you, your actions become powerful and focused. You often act behind the scenes, but that does not diminish their impact. You consider influences that others find not important, too small or vague, and that adds subtlety to your strategy.

This is the short answer - click for the complete one.

The initiative

    
The top line (Heaven-line) shows the change of the focus or initiative.
变上为离，为火，乃雷散日出，晦极生明，主人三三 器识高迁，鉴察深远。
When the top line changes Thunder activates Li, activates Fire. The thunder dispels and the day begins. When the night has reached its climax, the light is born. The talents and knowledge of this person are (三三 repeatedly) great and intricately linked, his discernment is profound and critical.

The subject

    
The bottom line (Earth-line) shows the change of the field or subject.
变下为坤, 为地, 雷人地中, 雨泽不施也, 必致饥荒。
主人无识, 萧索乖戾, 中生多阻。
  The bottom (line) activates Kūn, activates earth. Shocks in the earth, no rain will fall in the marsh, it will lead to a poor harvest. There is no hesitation; the determination is reckless. There will be powerful people who are ignorant, indifferent, and non-conforming. One encounters much resistance in one's life.

The outcome

    
The middle line (Man-line) shows the outcome.

  The middle line indicates the result. It is unchanging yin, this project will stay attractive, but also continue to absorb efforts, knowledge or resources, because its developing stage is not finished and not all possibilities have been explored. It still needs input and keeps doing so for the time being. It is too early to decide about a final direction, there will be no output yet.
  But yin is the one who can bring about concrete results. Yin stays in the background and does the work. It is nurturing, defusing crises, monitoring the process, building up and rounding out.
  This is the 'man' line, it can also be about you yourself, not only what you do.

Love for the work dissolves the effort.

  

  The three helpers
  Each line, active or at rest, summons one of the 8 trigrams as a Helper.

  For an activated line: telling you what you need - or about a problem area or something to avoid.
  For a stationary line: this is what you already have or do or what you don't need. Often we just need a reminder of our abilities. Or it could be what you wish or fear - but will not happen.
  Active lines are the helpers to change things, they listen to intentions, which can come from you, surroundings, or fate. Stationary helpers are part of the core meaning, they are your soul talking, but they also see the impossibilities. They reinforce the overall power of a reading.

  Advice or help for the initiative: Li, Fire, with her power to discern and create order.
  Advice or help for the subject: Kun, Earth, with her ability to nurture and concretize.
  Advice or help for the outcome: Dui, Lake, with her ability to resonate and persuade, is lacking here or not needed. Yin remains Yin.