C2V12:

C2V12: Nobody born! SHREE KRISHNA says nobody die either. Everyone is manifestation of rule of nature. Our mentality, view, physical appearance keep on changing throughout our life. Am I not some one specific? Then who am I? What is my identity? Which one of my identity is true? Of 7 years age or of 70 years ?
SHREE KRISHNA is teaching us via Arjun to think in this way. Our existence in this earth is exclusively temporary. The theory which is manifested as me could always be manifested 100 years back or latter. A box of match which has not yet been made but will be made in the next month would also make fire. And to predict this one do not have to be an astrologer. So the behavior of the thing which is still not born also defined. So when I was not born the theory and logic of my appearance and behavior also was there. The logic of my being as I am did not born with me, rather it ever exists. So the manifestation of the theory, which I am, has never been created nor will it ever be destroyed but as we have been changed since the birth a phase of non existence of my physical form will happen .

C2V11

C2V11: SHREE KRISHNA is saying to Arjun that he is thinking on the things which are not worth thinking but talking like a learned person. When we remorse for the dead, we contemplate what we could do to that person but did not do and regarding the remorse on an alive person we generally think that what the person could have been but what the person actually has become. In reality, these thinking make no effect on none of the dead or alive. So no remorse no contemplation on dead or alive would lead us to any wisdom.
Say for instance Arjun is contemplating about his cousin Duryodhan and expecting him to behave like Yudhisthir. This contemplation will never change Duryodhan rather it may cause misleading action taken by Arjun.