Sankaracarya's Vivekachudamani 484

वाचा वक्तुमशक्यमेव मनसा मन्तुं न वा शक्यते

स्वानन्दामृतपूरपूरितपरब्रह्माम्बुधेर्वैभवम् ।

अम्भोराशिविशीर्णवार्षिकशिलाभावं भजन्मे मनो

यस्यांशांशलवे विलीनमधुनानन्दात्मना निर्वृतम् ॥

vācā vaktumaśakyameva manasā mantuṃ na vā śakyate

svānandāmṛtapūrapūritaparabrahmāmbudhervaibhavam |

ambhorāśiviśīrṇavārṣikaśilābhāvaṃ bhajanme mano

yasyāṃśāṃśalave vilīnamadhunānandātmanā nirvṛtam ||

(Sankaracarya's Vivekachudamani 484)

Impossible for speech to express, impossible for the mind to conceive is the splendor of the ocean of the supreme Brahman, replete with the swell of the nectarine Bliss of the Self. In an infinitesimal part of It my mind has merged like a hailstone in the ocean, is now content with the essence of that Bliss.

In this sloka Sripad Sankaracarya is explaining that it's very difficult for the mind and speech to describe the nectarine experience with the Lord. No word can describe that. One has to experience such a wonderful experience, otherwise, we are simply trying to experience a delusional material world. The spiritual world is full of bliss.