Vasiṣṭha's teaching (Mahārāmāyaṇa) 3.60.63

3.60.63

ahaṃtvamityādijagatsvarūpā
viśuddhabodhaikavibhā vibhāti .
ākāśakośe nijaśūnyateva
dvaitaikyasaṃkalpavikalpanācca .. 63

63. [Sanskrit available] The notion of myself, thyself and the objective world, are but effusions of our perverted understandings; and it is ignorance only that shows the One as many within the Sheath of the mind, according as it imagines it to be.

62. [Sanskrit available] There is but one Being (SAT), who is Holy and without beginning; and who, though he appears to be of the forms of light and darkness, and of space and time, doth never rise nor set anywhere. He is without beginning, middle or end; and remains as a vast expanse of water, exhibiting itself in its waves and currents.