Justice League Unlimited, Season 1

Lex Luthor:
The truth is, for all my struggles to make my mark in life, for all I've accomplished, in just a few short generations my name will be forgotten. Even the greatest of us can't compete with time... and death.

Amazo:
Then why do you go on? Why does anyone? Why don't I just destroy you and everything else right now? [winds start swirling] All it would take is a single thought and-

Lex Luthor:
No! If you do that, you won't see the end of it!

Amazo:
The end of what?

Lex Luthor:
The evolutionary process. You of all beings should know something about that.

Amazo:
Yes. Yes, I'm evolving. That's why Professor Ivo made me. These past months I have amassed so much knowledge, and yet... I remain confused... empty. What am I evolving into? What is my purpose?! I must know! TELL ME!

Lex Luthor:
There's no way to tell. And that's why I stay in the game. My purpose, if you will, is to see where it's all going. And you! You'll live forever. You'll be able to see it all.

Amazo:
Is that my purpose? Simply to be... a witness?

Lex Luthor:
We create our own purpose in life. Now go create yours.