we have been clouding the mind with negative or evil thoughts that continue to revolve around the ego and we have accumulated bad karma since the previous lives, so we can no longer connect to the soul (inner self, Atman) that thickly covered with the lower-dimensional energy. It is necessary to purify the deeds in order not to repeat suffering or be reborn from the samsara, reincarnation, that continues to revolve around the ego which is the axis.