Srimad-Bhagavatam: Canto 1 - Chapter 1 - Verse 27

Sanskrit:

नातिप्रसीदद्‍धृदय: सरस्वत्यास्तटे शुचौ ।वितर्कयन् विविक्तस्थ इदं चोवाच धर्मवित् ॥ २७ ॥

ITRANS:

nātiprasīdad-dhṛdayaḥsarasvatyās taṭe śucauvitarkayan vivikta-sthaidaṁ covāca dharma-vit

Translation:

Thus the sage, being dissatisfied at heart, at once began to reflect, because he knew the essence of religion, and he said within himself:

Purport:

The sage began to search out the cause of not being satisfied at heart. Perfection is never attained until one is satisfied at heart. This satisfaction of heart has to be searched out beyond matter.