The Perfection of Equanimity - Citta unaffected by attachment and aversion

The perfection of equanimity is evenmindedness, it is non-disturbance by controversial conduct of people or by trying events.
If we do not develop satipatthana, we are easily affected by attachment and aversion and the citta is not calm. We encounter external objects which cause sadness and distress. Our unhappy mood is conditioned by unpleasant objects which appear through eyes, ears, nose, tongue and bodysense. People who are free from sorrow are unaffected by attachment and aversion with regard to people and events and this means that they have developed the perfection of equanimity.
When people see someone who kills a snake, they believe that they have loving- kindness and compassion for the snake that is being killed, but in reality they are disturbed by aversion towards the person who kills the snake. One should be aware and investigate the citta at that moment: what type of citta arises when one thinks of the person who kills a snake? We may not have loving-kindness, but then, we can have equanimity when we realize that everyone receives the results of his deeds. When kusala cittas arise we may have loving-kindness and also compassion; we feel sorry for the person who commits akusala kamma, because he will receive the result of akusala kamma. When equanimity arises, we are not disturbed and we do not utter unsuitable speech to someone who commits akusala kamma. Loving-kindness and equanimity arise with kusala citta. We should not take akusala for kusala. We should not believe that akusala dhamma is good and that we should utter strong language to the person who commits akusala kamma. The citta which is disturbed is akusala citta. If we develop panna we can know the characteristic of the citta that is stable, unaffected by attachment and aversion. Then we can further develop the perfection of equanimity.