維摩經玄疏 4.62

4.62

Sixth, explaining how the four teachings connect to the sūtras and treatises: The Buddha used the four teachings to bring forth all sudden and gradual sūtras; how could the treatises commenting on the sūtras go beyond the four teachings? There are thus two aspects: first, in relation to the sūtras; second, in relation to the treatises.