Neon Genesis Evangelion

Kaworu Nagisa:
I thank you friend Shinji, I wanted you to stop Unit 2 and take her from me. Otherwise, with her, I might have survived much longer.

Shinji Ikari:
Kaworu, but why?

Kaworu Nagisa:
It is my destiny to live forever, though my survival will bring destruction to the human race. However, it is possible for me to be killed, and whether I live or die makes no great difference. In truth, death may be the only absolute freedom there is.

Shinji Ikari:
What are you? Kaworu, I don't understand. What you are talking about, Kaworu?

Kaworu Nagisa:
This is my wish: please, destroy me. Otherwise, you will be destroyed. Only one life-form can be chosen to evade the destruction and seize the future! And yours is not the existence which should die. You need the future; it is what you live for! Thank you Shinji, my life was meaningful because of you.