14.11 Self alone remains after negating everything. No other effort is needed to know Self. It is self-revealing. The knowledge that Self is Brahman is enlightenment. On enlightenment, the (last) desire for liberation goes away resulting in contentment and peace.
14.12 Shankara advises that a seeker should aspire to think that he is all-pervading Self which is beyond mind and body system (MBS). MBS is the locus of miseries. I, the Self, am beyond miseries. Let the mind and body take action to remove miseries. Nothing can be added or subtracted from Self. How can Self do anything?