Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 26

Sanskrit:

उपर्यधश्च ये लोका भूमेर्मित्रात्मजासते ।तेषां संस्थां प्रमाणं च भूर्लोकस्य च वर्णय ॥ २६ ॥

ITRANS:

upary adhaś ca ye lokābhūmer mitrātmajāsateteṣāṁ saṁsthāṁ pramāṇaṁ cabhūr-lokasya ca varṇaya

Translation:

O son of Mitrā, kindly describe how the planets are situated above the earth as well as underneath it, and also please mention their measurement as well as that of the earthly planets.

Purport:

Yasmin vijñāte sarvam evaṁ vijñātaṁ bhavati (Muṇḍaka Upaniṣad 1.3). This Vedic hymn declares emphatically that the devotee of the Lord knows everything material and spiritual in relationship with the Lord. Devotees are not simply emotional, as is ill conceived by certain less intelligent men. Their direction is practical. They know everything that is and all the details of the Lord’s domination over the different creations.