Chih-i’s concept of a bodhisattva who performed Sudden practices presaged Saichō’s claim that the Perfect precepts were suitable for the bodhisattva who could take a direct path (jikidō) to enlightenment. However, a crucial difference remained between the views of Chih-i and Saichō. Chih-i never attempted to reject the Hinayāna precepts, nor did he argue that ordinations with bodhisattva precepts should precede full Hinayāna ordinations. In the Fa hua hsüan i, he stated that the Hinayāna precepts should be explained in a way which revealed their Mahāyāna contents. According to Chih-i, the bodhisattva who followed Sudden practices perfected and encompassed both the Hinayāna and Mahāyāna precepts. Consequently, the concept of sudden practices did not imply that the Hinayāna precepts were to be rejected.

Besides the concept of a bodhisattva who performed Sudden practices, Chih-i also introduced another concept utilized by Saichō, the Perfect precepts (enkai). The term ‘Perfect precepts’ referred to Chih-i’s classification of Buddhist doctrine into four categories and designated the precepts appropriate for followers of the Perfect teaching. Chih-i equated the Perfect precepts with the precepts of the Buddha. They were realized through meditation, practice, and the development of a mind which was free from passions and thus able to perceive things as they really are (jissōshin). The Perfect precepts were usually not identified in Chih-i’s writings with any particular set of rules such as the precepts of the Fan wang ching (Sūtra of Brahma’s Net), Hinayāna sets or even with the anrakugyō (Serene and Pleasant Activities) of the Lotus Sūtra. Elsewhere, however, Chih-i stated that adherence to the Lotus Sūtra (jikyō) was equivalent to holding the most profound precepts. Such precepts were called absolute (rikai) and were free of specific content. They were realized in two ways. A monk or nun might gradually practice precepts of increasing subtlety until the Perfect precepts were attained, or he or she might attain them in an instant through Sudden practices.