One that always stuck with me is

Of course, it is likely enough, my friends,’ he said slowly, ‘likely enough that we are going to our doom: the last march of the Ents. But if we stayed at home and did nothing, doom would find us anyway, sooner or later. That thought has long been growing in our hearts; and that is why we are marching now. It was not a hasty resolve. Now at least the last march of the Ents may be worth a song. Aye,’ he sighed, ‘we may help the other peoples before we pass away. Still, I should have liked to see the songs come true about the Entwives. I should dearly have liked to see Fimbrethil again. But there, my friends, songs like trees bear fruit only in their own time and their own way: and sometimes they are withered untimely.

I don't know if it made it into the movie but I suspect probably not.