Ethically they had arrived at the conclusion that man's supremacy over lower animals meant not that the former should prey upon the latter, but that the higher should protect the lower, and that there should be mutual aid between the two as between man and man. They had also brought out the truth that man eats not for enjoyment but to live.
Autobiography: The Story of My Experiments with Truth (ed. Courier Corporation, 1948) - ISBN: 9780486245935