Incense is originally a pleasant thing, but it becomes a tool of revenge due to the hatred and desire of the human heart, pointing out that the poison of the human heart is far more poisonous than the poison of spices.
Ten years ago, Shen Yan retreated to atone for his sins by mixing incense and wine, and ten years later, Gu Manzhi used incense to take revenge. Gu Yan, his father and his son, both died of the same incense because of their greed for personal affairs and abandonment of the family.
Intention: The incense is pure, and the right way is to do good in one's heart.