" But those men who know anything at all about the Light also know that there is a fierceness to its power, like the bare sword of the law, or the white burning of the sun." Suddenly his voice sounded to Will very strong, and very Welsh. "At the very heart, that is. Other things, like humanity, and mercy, and charity, that most good men hold more precious than all else, they do not come first for the Light. Oh, sometimes they are there; often, indeed. But in the very long run the concern of you people is with the absolute good, ahead of all else. You are like fanatics. Your masters, at any rate. Like the old Crusaders -- oh, like certain groups in every belief, though this is not a matter of religion, of course. At the centre of the Light there is a cold white flame, just as at the centre of the Dark there is a great black pit bottomless as the Universe."
His warm, deep voice ended, and there was only the roar of the engine. Will looked out over the grey-misted fields, silent.
"There was a great long speech, now," John Rowlands said awkwardly. "But I was only saying, be careful not to forget that there are people in this valley who can be hurt, even in the pursuit of good ends. "

― Susan Cooper