Yi Jing, Oracle of the Moon

  Zhèn-Xùn, Thunder-Wind

    

  When Zhèn activates Xùn, the trigram of wind and wood, they make the branches sway from the roots, they make all things act from their core. It is the relentless movement that follows fate and finds its destiny. Whenever you stray from your birthright, you have the opportunity to retrace your steps and find the right direction again. Walking your dao means following your essential path without deviating, even if it takes you along winding roads.
  Thunder can be overwhelming, but when Wind learns to deal with its vehemence, they accomplish great things.

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.
变中爻为兑,为泽,雷泽交施,
When the middle line changes, it activates Dui, which activates rain. Thunder and rain work together.
  (施 is harmonious cooperation: image of a flag, "following the wind")

  

  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.