Just saving some quotes:
"It was once convenient to think biblically, to believe we're surrounded for our benefit by edible automata on land and sea. Now it turns out that even fish can feel pain. This is the growing complication of the modern condition, the expanding circle of moral sympathy."
"(...)[A]fter a certain age, when the remaining years first take on their finite aspect, and you begin to feel for yourself the first chill, you watch a dying man with a closer, more brotherly interest."