Vasiṣṭha's teaching (Mahārāmāyaṇa) 3.60.54

3.60.54

balavaccidvilāsānāmanuvṛttyā parasparam .
svabhāvāḥ pratibimbanti cidādarśe svabhāvataḥ .. 54

53. [Sanskrit available] The mind which is fixed in the meditation of God, and remains unshaken amidst the turmoils of the world; is fraught with perfect rest, and preserves the composure of the soul, until its final liberation from the bondage of the body.

54. [Sanskrit available] But the thoughts of the fluctuating enjoyments of this world, alternately represented in the mirror of the mind, like the shadows of passing scenes upon a looking glass.