Human Source

Once love is born it never dies no matter how much you hate or forget that person. It reminds you it is still there once you cool down or you meet that person again. It is the most powerful energy we create within ourselves but we have yet to understand it, use it to help people and power us and our surroundings.  

In Harry Potter, in order for the patronus charm to work, one must think of the happiest memories they have in order to defeat the death eaters. Magic aside, hopefully in the future clean energy will come within us.  
 
In Interstellar, love does cross all dimensions and connect the different times there are, forward or backward. It drives us for a greater purpose beyond ourselves to do better, to be better cause the response is where we feed out of to fill our energy of love.  
 
The chemicals of love are the most powerful energy in us and maybe in the universe.