Sankaracarya's Vivekachudamani 482

किंचित्कालं समाधाय परे ब्रह्मणि मानसम् ।

उत्थाय परमानन्दादिदं वचनमब्रवीत् ॥

kiṃcitkālaṃ samādhāya pare brahmaṇi mānasam |

utthāya paramānandādidaṃ vacanamabravīt ||

(Sankaracarya's Vivekachudamani 482)

After concentrating his mind on the Supreme Brahman for some time, he rose, and out of supreme Bliss, he spoke as follows.

Sripad Sankaracarya shall explain further about eternal bliss and the Supreme Personality of Godhead after his meditation.