Chandogya Upanishad (with commentary) · Chapter 7.13

ChUpBh_7,12.2 phalaṃ śṛṇvākāśavato vai vistārayuktānsa vidvāṃllokānprakāśavataḥ /
prakāśākāśayornityasaṃbandhātprakāśavataśca lokānasaṃbādhānsaṃbādhanaṃ saṃbādhaḥ saṃbādho 'nyonyapīḍā tadrahitānasaṃbādhānurugāyavato vistīrṇagatīnvistīrṇapracārāṃllokānabhisidhyati /
yāvadākāśasyetyādyuktārtham //2//
iti cchāndogyopaniṣadi saptamādhyāyasya dvādaśaḥ khaṇḍaḥ
=======================================================================
START ChUp 7,13.1-2
smaro vāvākāśād bhūyaḥ |
tasmād yady api bahava āsīrann a smaranto naiva te kaṃcana śṛṇuyur na manvīran na vijānīran |
yadā vāva te smareyur atha śṛṇuyur atha manvīrann atha vijānīran |
smareṇa vai putrān vijānāti smareṇa paśūn |
smaram upāssveti

sa yaḥ smaraṃ brahmety upāste |
yāvat smarasya gataṃ tatrāsya yathākāmacāro bhavati yaḥ smaraṃ brahmety upāste |
asti bhagavaḥ smarād bhūya iti |
smarād vāva bhūyo 'stīti |
tan me bhagavān bravītv iti