In many religions, there is a reference to the heart, separate from the mind. Phrases like from the innermost heart and purity of the heart are found. What is this heart?
In the Tip of the Writing Brush, it is said that this heart functions to sweep our evils (greed, arrogance, and self love) produced by our minds. Like the sand that attracts the waste in our sewer system, this heart functions to isolate and contain our evils in our bodies
Prepare to clear this mind quickly. Purify it by using a filter and sand. 3-10
This filter, where do you think it is. The heart and the mouth are the sand and filter. 3-11
Like the organs in our bodies that are designated to removed the impurities in our bodies (Golgi), the heart functions to remove our mental dusts. Some may say that the heart as we know it physically, is this organ. Others may say that this heart is our soul that is immeasurable by instruments. This heart (soul) collects and stores our evils, and eventually eliminates it from our bodies.
Where do our evils that are trapped by the heart go? They go out the body and are converted to another form of energy, coming back to us in the form of some type of physical occurrence. A strenuous incident, an angry co-worker, an illness may be the result of this released energy from the heart. These occurrences have the energy potential of generating more evil in our minds if we do not understand this cycle of energy transfer.
Many of us will become frustrated by these occurrences, and react by producing more evil thoughts. But for those who understand this concept of causality, they will joyously accept these occurrences as a way of sweeping our existing evils from our hearts: and will avoid producing more evils of greed, arrogance, and self-love.
In one of the sacred books, it states that God does not want us to apologize for our past sins or evils. But it is the determination to live joyously when confronted with causality that God will accept as our apology. We have a natural process of sweeping our minds of evil. Our hearts (soul) and our true sincerity provide a way of eliminating evil from our minds. When our minds are pure, our hearts will be pure as they were in the beginning. There will be no more suffering.