You don't choose what to believe. Belief chooses you.

By the time the last few notes fade, his hope will be restored, but each time he's force to resort to the Adagio it becomes harder, and he knows its effect is finite. There are only a certain number of Adagios left in him, and he will not recklessly spend this precious currency.

Do you know the difference between an optimist and a pessimist? A pessimist says ‘Oh dear, things can’t possibly get any worse.’ And an optimist says, ‘Don’t be so sad. Things can always get worse.

You don't choose what to believe. Belief chooses you.

Do they hate the idea of her, because she's different from them, and that in this difference there might be some sort of inferiority or superiority that is hers or theirs, that in the end threatens the potential happiness of everyone?

Because civilization isn't a thing that you build and then there it is, you have it forever. It needs to be built constantly, recreated daily. It vanishes far more quickly than he ever would have thought possible. And if he wishes to live, he must do what he can to prevent the world he wants to live in from fading away. As long as there's war, life is a preventative measure.

If this city is to die, it won't be because of the men on the hills, it will be because of the people in the valley. When they're content to live with death, to become what the men on the hills want them to be, then Sarajevo will die.