Vasiṣṭha's teaching (Mahārāmāyaṇa) 6.28.36

6.28.36

anyathā bhāvyate rāma bhūyate tadihānyathā .
ayaṃ so'yaṃ mamāyaṃ ca saṃsāra iti bhāvite .. 36

36. [Sanskrit available] He that thinks himself as another, is transformed to the nature of that air (as it is the pattern that moulds a thing after its own model): and the thought that you are this or that, and have this thing or others for yourself, is what actually makes you so in this world. (The metamorphose of the natures and forms of things and persons to other kinds in Ovid, were all owing to their tendencies and inclinations towards them).