"To my mind the life of a lamb is no less precious than that of a human being. I should be unwilling to take the life of a lamb for the sake of the human body. I hold that, the more helpless a creature, the more entitled it is to protection by man from the cruelty of man."
January 1, 1970
https://en.wikiquote.org/wiki/The_Story_of_My_Experiments_with_Truth