Brahma Sūtra 1.2.11
Śaṅkara
Advaita Vedānta
Sūtra
गुहां प्रविष्टावात्मानौ हि तद्दर्शनात्
guhāṃ praviṣṭāvātmānau hi taddarśanāt
Sūtra translation
The 'two entered into the cave' (are the individual soul and the highest Self), for the two are (intelligent) Selfs (and therefore of the same nature), as it is seen (that numerals denote beings of the same nature).
In the same Kathavallî we read (I, 3, 1), 'There are the two drinking the reward of their works in the world, (i.e. the
Rāmānuja
Viśiṣṭādvaita Vedānta
Sūtra
गुहां प्रविष्टावात्मानौ हि तद्दर्शनात्
guhāṃ praviṣṭāvātmānau hi taddarśanāt
Sūtra translation
The 'two entered into the cave' are the two Selfs; on account of this being seen.
The two, entered into the cave and drinking their reward, are neither the embodied soul together with the vital breath, nor the embodied soul
Madhva
Dvaita Vedānta
Sūtra
गुहां प्रविष्टावात्मानौ हि तद्दर्शनात्
guhāṃ praviṣṭāvātmānau hi taddarśanāt
Sūtra translation
The two (who have entered) into the cave, are indeed, both Atman (the Lord), from this very well-known characteris- tic, and from scripture to that effect.
The two in the cave (heart) that are drinking (the essence of bliss) are only the two forms of Vishnu. ‘ The p$lorious two