Rāmānujaon Brahma Sūtra 3.3.21
Viśiṣṭādvaita Vedānta
Sūtra
न वा विशेषात्
na vā viśeṣāt
Sūtra translation
Or not so, on account of difference.
This is not so, for as Brahman is to be meditated upon in two different abodes, the meditations are separate. In both the Sândilya-vidyâs, on the other hand, Brahman is to be meditated upon as abiding within the heart.