In this paper, among the six cultivations spoken of by the so-called Sarvāstivādins of the Western Region (西方諸師), I examine the background of saṁvarabhāvanā. Generally speaking, there are four cultivations for the Sarvāstivādins. Notably, however, scholars of the Sarvāstivādins of the Western Region argued that there are six cultivations. As a result, it is clear that they made their theory based on some sūtras in the Six Senses (ṣaḍāyatana) chapter of the Saṁyukta-Āgama.
