Gita : Ch-5. Introduction-3.
Srimad Bhagavad-Gita : Chapter-5. ( Karma-sanyasa-yogam ) Introduction-2. Lord Sri Krishna has already explained during discussions with Arjuna on Karmam in third and fourth chapters in detail. Hereafter, after following and practicing them, Sadhaka-s should achieve the Supreme Goal 'Perfection'. Therefore, hence Lord has to explain the method to "how to discard 'Karmam' intelligently. From 'Tamasic' and 'slumber' it is essential to awake human being and initiate /engage him in Karmam. At least let him do karmam for his selfish needs, if he proceeds like this ...