what voldemort don't know

If there is one thing Voldemort cannot understand, it is love.
Albus Dumbldore, Book 1

So, you have come. I thought you would… one day. But your journey was pointless. I never had it. Kill me, then, Voldemort, I welcome death! But my death will not bring you what you seek… there is so much you do not understand… Kill me, then! You will not win, you cannot win!
Gellert Grindealwald, book 7

his knowledge remained woefully incomplete, Harry! That which Voldemort does not value, he takes no trouble to comprehend. Of house-elves and children’s tales, of love, loyalty and innocence, Voldemort knows and understands nothing. Nothing.
Albus Dumbledore, Book 7

I know things you don’t know, Tom Riddle. I know lots of important things that you don’t.
Harry Potter, Book 7

알버스 덤블도어, 겔러트 그린델왈드, 그리고 해리 포터까지! 7권에서 진정한 죽음의 지배자(master of death)였던 세 인물이 모두 things voldemort not understand and don't know를 외치고 있다. 충성심, 고결함, 그리고 사랑. 천문탑의 현자 덤블도어가 한평생 사랑한 그린델왈드와 해리 두 사람, 두 Dumbledore's man을 통해서 직접 볼드모트에게 선언하고 있다.