"I 'm not sleeping very well," Donaldson answered.
"You haven't a fever or anything?"
"No. Just restless."
"I have n't slept very well myself. I 've been doing so much thinking. That keeps a fellow awake."
"Yes—thinking does. You 'd better let your brain close up shop and get some rest."
"I can't. I 've been chewing over what you said, and the more I think of it, the more I see that you have the right idea. The secret of keeping happy is to fight for others. It's the only thing that will make a man put up a good fight, isn't it?"
"The only thing," answered Donaldson.
"I don't understand why I did n't realize that before—with Elaine here. You 'd think she would make a man realize that."
Donaldson did not answer.
"I think one reason is," continued the boy, "that until now, until lately, she's been so nervy herself that she did n't seem to need any one. She 's been stronger than I. But last night she looked like a little girl. And now, I'd like to die fighting for her."