Srimad-Bhagavatam: Canto 7 - Chapter 1 - Verse 49


अथ नित्यमनित्यं वा नेह शोचन्ति तद्विद: ।नान्यथा शक्यते कर्तुं स्वभाव: शोचतामिति ॥ ४९ ॥


atha nityam anityaṁ vāneha śocanti tad-vidaḥnānyathā śakyate kartuṁsva-bhāvaḥ śocatām iti


Those who have full knowledge of self-realization, who know very well that the spirit soul is eternal whereas the body is perishable, are not overwhelmed by lamentation. But persons who lack knowledge of self-realization certainly lament. Therefore it is difficult to educate a person in illusion.


According to the mīmāṁsā philosophers, everything is eternal, nitya, and according to the Sāṅkhya philosophers everything is mithyā, or anitya — impermanent. Nonetheless, without real knowledge of ātmā, the soul, such philosophers must be bewildered and must continue to lament as śūdras. Śrīla Śukadeva Gosvāmī therefore said to Parīkṣit Mahārāja: “Those who are materially engrossed, being blind to knowledge of the ultimate truth, have many subjects for hearing in human society, O Emperor.” (Bhāg. 2.1.2) For ordinary persons engaged in material activities there are many, many subject matters to understand because such persons do not understand self-realization. One must therefore be educated in self-realization so that under any circumstances in life he will remain steady in his vows.