Gotham, Season 4

Ra's al-Ghul:
Every moment of my life is agony. End my suffering.

Bruce Wayne:
Whatever your curse is, you deserve it for what you've done!

Ra's al-Ghul:
You're angry, Bruce. I understand. But unless you strike me down with that blade, you will never be free.

Bruce Wayne:
No! I won't!

Ra's al-Ghul:
Then allow me to tell you what will happen if you don't kill me. I will disappear, and let you live your life. You will follow the path of light, grow into a fine man. Become a husband. A father. There may be a day where you forget I ever existed. But then I will return, and I will kill everyone you love. Just as you watched your parents die, just as you watched me slice your friend's throat, I will slaughter your wife and children before your very eyes, and there will be nothing you can do about it!

[Bruce stabs him with the dagger]

Bruce Wayne:
Die!