The Door in the Wall
by Marguerite de Angeli
(1949, 121 pp.)
My favorite passage sums up this book nicely:
"Fret not, my son. None of us is perfect. It is better to have crooked legs than a crooked spirit. We can only do the best we can with what we have. That, after all, is the measure of success: what we do with what we have."
Robin is a boy whose father expects him to be a knight. When his father goes off to war, Robin is left alone and falls ill. His legs are slightly crippled afterward. Some monks come to his aid and he learns to "do the best with what he has." Recommended.