The meaning of this sentence is: it is not external things that require people to do this, but from our inner feelings, that is to say, the feelings of our parents and ancestors from the heart are manifested in behavior as sacrifices. Therefore, since this sacrifice is from the heart, there must be sincere respect. This sentence comes from the Book of Rites.
According to ancient records, it's hard to say whether the deceased knew how to collect paper money during Qingming Festival. It's hard to say that sweeping graves is more about remembering ancestors and pinning the grief of future generations, indicating that the owner of the tomb has future generations, and future generations know filial piety.
Characteristics of The Book of Rites;
The Sacrifice System puts forward ten kinds of sacrificial meanings, which not only affirms the religious significance of "seeing ghosts and gods", but also highlights the ethical significance of sacrificial activities.
Based on the ethical significance of sacrifice and the ritual theory of the unity of sacrifice and heart, the sacrifice system defines sacrifice as a way to get close to others. Sacrificing relatives requires the filial son to devote himself to fasting to repair his body and mind, and strive to achieve a sincere and respectful mental state, so as to obtain the sacred experience of "respecting God".