Read it through once

"Ah, but you shall go, I've set my heart on it; that's what I tried for, and that's why I succeeded. I never get on when I think of myself alone, so it will help me to work for you, don't you see? Besides, Marmee needs the change, and she won't leave you, so you _must_ go. Won't it be fun to see you come home plump and rosy again? Hurrah for Dr. Jo, who always cures her patients!"