大乘起信論義記 3.195

3.195

若心有起，更見前法可念者則有所少。如是淨法無量功德，即是一心，更無所念，是故滿足。名為法身如來之藏。

"If the mind arises and further sees an object before it to be thought of, then there is a deficiency. Such pure dharmas of immeasurable meritorious qualities are precisely the One Mind, with nothing further to be thought of; therefore they are fulfilled. It is called the dharmakāya, the tathāgatagarbha."