Text 2.1
Conclusion  The Perfection of Benundition
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senses, who can always help us attain mental serenity. Arjuna requests Him to summarize everything in such a way that he can remain equiposed. Yet he has some doubts, and doubts are always compared to demons. He therefore addresses Kṛṣṇa as Keśinisūdana. Keśī was a most formidable demon who was killed by the Lord; now Arjuna is expecting Kṛṣṇa to kill the demon of doubt
TEXT 2.
श्रीभगवान्ताना  ।
काम्यानां कर्मणां न्यासं संन्यासं कवयो विदुः । 
    सर्वकर्मफलत्यागं ग्राह्तस्त्यागं विचक्षणाः ॥ २ ॥
śrī bhagavān uvāca kāmyānāṁ karmaṇāṁ nyāsaṁ sannyāsaṁ kavayo viduḥ sarva-karma-phala-tyāgaṁ prāhus tyāgaṁ vicakṣaṇāḥ
śrī bhagavān uvāca —the Supreme Personality of Godhead said;  kāmyānām —with desire;  karmaṇām —activities;  nyāsam —renunciation;  sannyāsam —renounced order of life;  kavayaḥ —the learned;  viduḥ —know;  sarva —all;  karma —activities;  phala —of results;  tyāgam —renunciation;  prāhuḥ —call;  tyāgam —renunciation;  vicakṣaṇāḥ —the experienced.
TRANSLATION
The Supreme Lord said, To give up the results of all activities is called renunciation [tyāga] by the wise. And that state is called the renounced order of life [sannyāsa] by great learned men.
PURPORT
The performance of activities for results has to be given up. This is the instruction of  Bhagavad-gītā . But activities leading to advanced spiritual knowledge are not to be given up. This will be made clear in the next verse. There are many prescriptions of methods for performing sacrifice for some particular purpose in the Vedic literatures. There are certain sacrifices to