Vasiṣṭha's teaching (Mahārāmāyaṇa) 6.28.32

6.28.32

manasaḥ svayamevāntaḥsaṃkalpakalanodbhavā .
vicitraracanopetaṃ manastatrāttavibhramam .. 32

32. [Sanskrit available] There rises of itself a willful creation within the mind, and out of its own accord as if it were so ordained by destiny; and the mind being fully possest of the great variety of forms, is lost at last into the error of taking them for true.