I fully subscribe to the judgement of those writers who maintain that of all the differences between man and the lower animal, the moral sense of conscience is by far the most important…It is the most noble of all the… — Charles Darwin Copy Share Image
Of all the differences between man and the lower animals, the moral sense or conscience is by far the most important . . . [I]t is summed up in that short but imperious word ought, so full of high significance.… — Charles Darwin Copy Share Image