The Most Powerful Thing In The World

It was when Harry Potter said "I am ready to die,"...When Katniss Everdeen said "I volunteer as tribute." It was when Princess Anna chooses death for herself to save her sister, Elsa.......It was then...

...and it is that thing which stirs the hearts of all who experience it: a certain kind of love, devotion and sacrifice.  It breaks down everything. It is sacrificial love. 

"The shepherd lays down his life for his sheep." (John 10:11)

"Greater love has no one than this, that someone lay down his life for his friends." (John 15:13)