I'd like to answer with some of my favourite comic quotes:
"You have shown them the face of the man of tomorrow. You have given them an ideal to aspire to, embodied their highest aspirations. They will race, and stumble, and fall, and crawl... and curse... and finally... They will join you in the sun, Kal-El. In time you will no longer be alone"
Clark, Bruce, J'onn.
"All we've ever tried to do is save Krypton or Mars, save our parents and loved ones over and over again, but we never will..."
"We never did."
"No matter how many we save, we'll never make it right... We'll always be too late to save those we most needed to save... Better to die... Just die... Let it all die... We can't defeat this... Can't win against this oblivion... The end of it all"
"Shut up Clark, we always win!"...
"I don't care if it can destroy every god in every heaven, it's never faced us! Clark, are you listening to me?"...
"Fight it Clark!"...
"Last chance, and I can't believe I'm trying to convince you. Fight it Clark! We can do this together. REJECT MAGEDDON! Humanity's last stand, Clark! Thousands are dying right now! Billions more will die in minutes! Save them SUPERMAN, or, God help me I'll hound you through the afterlife until you beg for mercy!!!"
"... I... Really hate that lecturing tone, Bruce... But it's always when I need to hear it most"
"Clark, this is the essence of Mageddon. You can't handle this alone!"
"I'm not alone, I have you and J'onn with me. You're never alone in the JLA Bruce. Here it comes"....
"We're with you, Clark. CLARK!"
"He's gone. J'onn! where is he?"
"He's in pain, in shadow. I can't feel anything... Superman is gone"
"Doomsday is cancelled until further notice"...
"I knew you'd say that Clark, just wasn't sure when..."
"Superman Prime... Ten billion sentient suns stand silent for a span. Entire constellations pause in their tracks to acknowledge the return of truth's greatest champion."
"This guy had circumnavigated the universe, wrestled evil gods fought battles we can't imagine... This being... Some things you just can't put in to words, man."
"I found a better story; one created to be unstoppable, indestructible! The story of a child rocketed to Earth from a doomed planet"
"First we tried to imagine a champion, a thought powered redeemer capable of saving the world. A made up messiah. I called our creation Superman after Nietzsche and Bernard Shaw. Our first attempt lived for a glorious twenty-five minutes. Not a single second of his brief life was wasted as he used it to articulate a code of ethics so pure and simple we all wept."