Kakusen 覺千 (active 18th century, conventional lifedates 1700–1782) was an Edo-period Tendai esoteric (Taimitsu 台密) scholar whose KR6t0119 Zhēnàyè xuézé 遮那業學則 (“Curricular Regulations for the Vairocana-Discipline”) provided the codified Edo-period curricular regulations for the Hiei-zan Tendai-esoteric training program.
The work distinguishes the Tendai kemmitsu transmission of esoteric Buddhism — descended from Saichō’s 最澄 importation and the medieval Taimitsu sub-lineage development — from the Tō-ji / Shingon transmission, opening with the programmatic statement: “The Sannō-Daishi entered Tang and, together with the Tendai Dharma-gate, also brought the mantra teaching back to our country. For this reason, our country’s Taimitsu sect is a kenmitsu-jointly-studied tradition. However, the mantra-teaching brought back by the Daishi is not identical to the mantra-teaching transmitted at Tō-ji…”
Kakusen’s Xuézé is part of the broader Edo-period Tendai scholastic-systematization movement, alongside the works of Reikū Kōken 靈空光謙 (1652–1739) and Sonshun 尊舜.