Tokuitsu is considered to have learned the Dharmalogy of the Hosso Study from Shuen and other monks at Todai-ji Temple first, and moved to Togoku (the eastern part of Japan, particularly Kanto region) at the age of 20 or so.
初め東大寺で修円らから法相教学を学んだとされ、20歳頃に東国へ下った。