Bhagavad Gita 18.1अर्जुन उवाच संन्यासस्य महाबाहो तत्त्वमिच्छामि वेदितुम्।त्यागस्य च हृषीकेश पृथक्केशिनिषूदन ॥

The teaching of the whole of the GitaSastra is summed up beautifully in this discourse. This last discourse is a brief masterly summary of all that is told in the previous chapters. Arjuna wishes to know the distinction between Sannyasa and Tyaga.Kesi was an Asura whom Lord Krishna slew. So Lord Krishna is addressed as Kesinishudana by Arjuna.The words Sannyasa and Tyaga have been used here and there in the preceding discourses but their connotations are not lucidly distinguished. Therefore Lord Krishna clearly explains to Arjuna the right significance of the two terms in the following verse.