योगवासिष्ठः yogavāsiṣṭhaḥ - book-4, chapter-38, verse-17

यथा बालो मनसा नगरस्य निर्माणं निर्मृष्टं च कुर्वंन्नगरनिर्माणं मनःकृतमकृतमिव लीलयानुभवति नोपादेयतयासुखदुःखमकृत्रिममिति पश्यति नगरनिर्मथनं च मनःकृतं कृतमिति पश्यतीति दुःखमपि लीलयानुभवन्नपि न दुःखमिति पश्यति ।
एवमसौपरमार्थतःकुर्वन्नपि न लिप्यत एवेति ॥ १७ ॥ yathā bālo manasā nagarasya nirmāṇaṃ nirmṛṣṭaṃ ca kurvaṃnnagaranirmāṇaṃ manaḥkṛtamakṛtamiva līlayānubhavati nopādeyatayāsukhaduḥkhamakṛtrimamiti paśyati nagaranirmathanaṃ ca manaḥkṛtaṃ kṛtamiti paśyatīti duḥkhamapi līlayānubhavannapi na duḥkhamiti paśyati ।
evamasauparamārthataḥkurvannapi na lipyata eveti ।
।
17 ।
।

यथा बालो मनसा नगरस्य निर्माणं निर्मृष्टं च कुर्वंन्नगरनिर्माणं मनःकृतमकृतमिव लीलयानुभवति नोपादेयतयासुखदुःखमकृत्रिममिति पश्यति नगरनिर्मथनं च मनःकृतं कृतमिति पश्यतीति दुःखमपि लीलयानुभवन्नपि न दुःखमिति पश्यति ।
एवमसौपरमार्थतःकुर्वन्नपि न लिप्यत एवेति ॥ १७ ॥

17. Behold the boy is led by his mind (fancy) to build his toy or hobby-horse, which he dresses and daubs at his wilful play, without showing any concern or feeling of pleasure or pain, in its making or breaking of it at his pleasure. So doth man build his aerial castle, and level it without the sense of his gain or loss therein. It is by his acting in this manner in all worldly matters, that no man is spiritually entangled to them.