Madhvaon Brahma Sūtra 4.1.11
Dvaita Vedānta
Sūtra
यत्रैकाग्रता तत्राविशेषात्
yatraikāgratā tatrāviśeṣāt
Sūtra translation
Meditation may be practised where, (when, etc.), concentration arises; for in that (in meditation or in knowledge), no difference is caused by particular spots, etc.
Only in that place, at that time, in that condition, etc., he should be (and practise meditation) where con- centration is possible. This is said in the Varahapurana : “ He should resort to that place only, seize that hour only, place himself in that condition only, seek those comforts only, which are favourable to securing serenity of mind. For by time, place, etc., there is no peculiarity said to be wrought in meditation, but all enquiry about time, place, etc., is meant for making the mind serene/’