Zhiyi’s 智顗 Weimojing shu 維摩経疏 and the three major commentaries have different concepts of the ten good deeds. The Weimojing wenshu 維摩経文疏 states that the ten good deeds are the precepts before the ten types of precepts originated from the Da zhidu lun 大智度論. On the other hand, the Mohe zhiguan 摩訶止観 says that the ten good deeds are natural morality, the basis of precepts and the first step of the ten types of precepts. Since three major commentaries were edited by Guanding 灌頂, it is necessary to research their former versions to examine the differences. Both the Yuandun zhiguan 圓頓止観 quoted in Shōshin’s 証真 works and the Zhiguan referred to in Guanding’s Guanxin lunshu 観心論疏 are supposed as the original version of the Mohe zhiguan. In the Yuandun zhiguan, natural morality isn’t included in the ten types of precepts, and their order is also different from that in the current Mohe zhiguan. However, the Guanxin lunshu has the same concept as the current Mohe zhiguan. Therefore, the description about the precepts in the Guanxin lunshu might be different from that of the original Mohe zhiguan. The concept of the ten good deeds in the Weimojing shu doesn’t contradict the Yuandun zhiguan, and that in the three major commentaries would be different from the original. Thus, the characteristic concept of the ten good deeds and natural morality in the three major commentaries might be due to Guanding’s editing.
