18(64)Now Lord krishna discloses Sarvaguhyatam which means guides Arjun and through Arjuna to all seekers the kernel of geetas preaching. to whome this preaching can be given to him only who has become dear to lord krishna by surrendering himself unconditionally at the feet of almighty. Karmayoga, gyanyoga are given to devotees who Satat yuktanam bhajati Lord with unflinching devotion Sharnagati is the Sumum Bonum of geetas message and that is the secrets of secrets which has been continuously repeated and here again lord lay emphasis Bhuyah srunu may Parmamvachah means hear My most valued Words