法華義疏 2.78

2.78

照而常寂名定，寂而常照名慧，慧發於外名經，靜極於內稱定，身心不動者結上二義也。以身不動結上身端，以心不動結上心靜，至人體實相而有身心，雖身不身身不動也。雖心不心，心不動也，故身同枯木、心若死灰。又身心不動，顯佛起定未期，生後疑問。

Illuminating while constantly still is called concentration; still while constantly illuminating is called wisdom. When wisdom is expressed externally, it is called a sūtra; when stillness reaches its utmost internally, it is called concentration. 'Unmoving in body and mind' concludes the above two meanings. By the body being unmoving, it concludes the above uprightness of the body; by the mind being unmoving, it concludes the above stillness of the mind. The ultimate person realizes the true aspect and yet possesses body and mind; though having a body, it is not an ordinary body, and the body is unmoving; though having a mind, it is not an ordinary mind, and the mind is unmoving; therefore the body is like withered wood and the mind is like dead ashes. Furthermore, the body and mind being unmoving reveals that the time of the Buddha's arising from concentration is not predetermined, giving rise to the subsequent doubts and questions.