I think he's saying that humans are incapable of love because of man's original sin (a christian belief). The only person capable of true love is the Father, or God. The prince has been seeking for love for his entire life, but was enlightened when he realized that it doesn't exist. That's why there was such dynamic character development - he no longer needs to seek for love.
it is basicly the main message of christianity. that the only correct way to live is to love everyone equally no matter their sins or weaknesses. as if everyone did this the world would be a perfect place, and because the world isn't a perfect place the fault falls not at others, the people of the past or any other beings. but you personally, as a being unable to love unconditionally.
as for the death part, the story of jesus is a perfect exemple of this. which is a story basicly everyone knows, you could ask yourself when in the story about jesus died; was it when he died on the cross, or when he went up to heaven after ressurecting, or was it when he was born being who he was as his unconditional love and life could only lead to one thing, death. not to mention, if he only lived his life for others, and not himself or his family.
it was as if he was allready dead, because he had no choice in what to do with his life; all he could do was struggle and do the right choices to the best of his ability til he died. is like the dead corpse, except u can decide to die at any point in your life and become nothing but nourishment for the good in the world.
but almost no people do that, because to do that u have to completely let go of your ego and selfishness which litterally is like a mental death in a way of who you are to become nothing but a servant of good and, or god.
I already said this before but goddamn, Thorkell is such a savage lmao. Thorfinn is probably light given his age and size but still, lauching a person around with a kick is just wow, also Canute had a 180 turn on his personality, that was pretty interesting