Monkey Heart - Horse Mind (心猿意马）

You may ask how monkey and horse are related to heart and consciousness. Here i should explain.

Monkey is synonymous with the heart.  It is fickle, unstable, and always changing, which is the behavior of our emotions or the heart.

Why are emotions related to the heart?  The heart is synonymous with strong feelings, linguistically we refer strong emotional issue with the heart, such as heart-felt, heart-pain, broken heart.  Physically we do feel sensation at the heart whenever we encounter emotional issues.

Meanwhile the horse is synonymous with our consciousness.  Our consciousness is but pure energy; it is like a horse, it needs a rider to go places and provide it with direction.

We are habitually allowing our consciousness (horse) to be taken control by our heart (monkey).  A preloaded energy shall always attract (charge) a pure energy to assume its polarity.  Which is why we always perceive (see, hear, feel, etc) things that are determined by our emotions.