योगवासिष्ठः yogavāsiṣṭhaḥ - book-5, chapter-18, verse-56

परतात्मीयतान्यत्वत्वत्वमत्त्वादिभावना ।
नेह सत्या महाबाहो द्विचन्द्रादिदृशो यथा ॥ ५६ ॥

paratātmīyatānyatvatvatvamattvādibhāvanā ,
neha satyā mahābāho dvicandrādidṛśo yathā 56

56. The thought of something as one's own and another's, and of this and that as mine, thine, his or others', are as false as the appearance of double suns and moons in the sky.