Observance of All Three Elements of the Threefold Learning

The Perfect precepts were much more than mere rules of conduct. All elements of the Perfect threefold learning were essentially expressions of the Buddha. They were grounded in one’s own inherently pure nature (jishō shōjō). Complete adherence to the precepts would result in complete mastery of meditation and wisdom. Perfect observance of the precepts in which the practitioner would never even be tempted to violate a rule would necessarily entail a profound understanding of the nonsubstantiality of all things. In such a case the practitioner’s observance of all three elements of the threefold learning would be immovable and unhindered (kokū fudō) by any obstacle.

Saichō: The Establishment of the Japanese Tendai School, p194