As man gradually advanced in intellectual power... His sympathies becomes more tender and widely diffused, so as to extend to man of all races... And to the lower animals - so will the standard of morality rise higher and higher.
~ Charles Darwin
A great #DarwinDay quote about the moral evolution of humankind. As our species developed, we learnt to form bonds that first applied to our family and kin.
Over time, our capacity for empathy developed, extending our sympathies to whole tribes, whole nations, whole species - and into the animal kindom.