"There is in man a disposition to compassion as generally diffused as his other instincts. Newton had cultivated this sentiment of humanity, and he extended it to the lower animals. With Locke he was strongly convinced that God has given to them a proportion of ideas, and the same feelings, which he has to us ... In truth, without humanity, a virtue which comprehends all virtues, the name of philosopher is little deserved."
January 1, 1970
https://en.wikiquote.org/wiki/Vegetarianism