In life, everyone is an individual, but in the end it is inseparable from the collective, because man is a social animal, and he also relies on the wisdom of the group to eventually become the master of the world and become the most powerful force on the earth. But even so, in the vast sea of people, many people still easily feel lonely, this loneliness is not because of no one to accompany, but at some times we tend to feel the emptiness of the soul, feel that we are incompatible with others as an individual or a harmonious state that cannot be achieved spiritually, so there is some sadness in the heart.