Guṇa-viveka, Haṁsa-gītā, and the Yoga that Cuts False Ego
तत्तत् सात्त्विकमेवैषां यद् यद् वृद्धा: प्रचक्षते । निन्दन्ति तामसं तत्तद् राजसं तदुपेक्षितम् ॥ ५ ॥
tat tat sāttvikam evaiṣāṁ yad yad vṛddhāḥ pracakṣate nindanti tāmasaṁ tat tad rājasaṁ tad-upekṣitam
Among the ten items I have just mentioned, the great sages who understand Vedic knowledge have praised and recommended those that are in the mode of goodness, criticized and rejected those in the mode of ignorance, and shown indifference to those in the mode of passion.
It teaches that what the truly wise elders approve is sāttvika (goodness), what they condemn is tāmasa (ignorance), and what they ignore or dismiss is rājasa (passion).
Krishna is training Uddhava to discern the modes of nature in social and moral judgments—how goodness aligns with the guidance of the wise, while passion and ignorance distort values.
Seek counsel from genuinely virtuous and experienced devotees/elders; treat what they praise as worth cultivating, avoid what they strongly criticize, and be cautious of pursuits that wise people consistently consider trivial or distracting.