Yi Jing, Oracle of the Moon

Zhèn-Kūn, Thunder-Earth
    

  When Zhèn activates Kūn, Thunder goes to the Earth, roots become strong and grounded; they have a firm position. However, success does not come quickly. If you hold on to your values and stick to the essence, you can energize and initiate, reconcile ideas and reality. But if there isn’t a good source or if you use it selfishly, it will end into empty bragging or promises.
  When Kun embraces Zhen, Heaven's voice, then everything moves according to Heaven and Earth.

This is the short answer - click for the complete one with the spirit helpers.

    About the 3 lines of the trigrams and the spirit 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 or what is lacking at the moment. They reinforce the overall power of a reading.