Geraldine Brooks said this quote

Are there any two words in all of the English language more closely twinned than courage and cowardice? I do not think there is a man alive who will not yearn to possess the former and dread to be accused of the latter. One is held to be the apogee of man's character, the other its nadir. An yet, to me the two sit side by side on the circle of life, removed from each other by the merest degree of arc. (MARCH - Chapter 11 - page 168)