Yi Jing, Oracle of the Moon

Qián-Kūn, Heaven-Earth
    

  When Qián changes to Kūn, the change is huge. It is a change which takes a lot of time with or without any end. But this might be the most important meaning of this change: the work of dealing with life, its ups and downs, its possibilities, and more importantly, its impossibilities and setbacks. Also the tough work of refusing when necessary or acceptance of the impossible. It is the hard part of the marriage vow: in health is much easier than in sickness. It is the big neverending work of growing a character, a soul, a strong mind and body, a relation, a vision - until death do us part.
  It is the struggle for survival and finding happiness in a severe world.

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.
九三变为兑泽。 小则为刚恶强硬, 大则为暴君酷吏, 惟谦恭自保, 则可免祸害之患也。
  Nine at the top activates the open Marsh. In the small there is strong evil, unyielding, in the big there are tyrants and oppressive officials, but through polite and modest self-confidence can one remain free from the worry of disaster.

The subject

    
The bottom line (Earth-line) shows the change of the field or subject.
静正则吉，往进则凶，阴道须得志，亦不可恃势妄作。
The bottom line activates Xun, activates the Wind. To be calm and indifferent to fame and gain, inclined to purity, is favorable. Wanting to go forward is unfavorable. The way of yin is fulfilling one's ambition. One cannot rely on one's position or influence or act recklessly or unethically.

The outcome

    
The middle line (Man-line) shows the outcome.
  变中爻为乾, 日落于天, 晚景逼迫, 光华隐藏, 难以超越。
When the middle line changes it activates Qian. Sunset in the sky, the evening landscape contracts, the brilliance of the sun hides and cannot surpass itself.

  

  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: Dui, Lake, with her ability to resonate and persuade.
  Advice or help for the subject: Xun, Wind, with her power to choose and influence.
  Advice or help for the outcome: Li, Fire, with her power to discern and create order.
  But when things are not satisfying, it might be that one or more helpers don't help enough - or try too hard. Or maybe you don't listen carefully enough.