Without Sin Series
"Love animals: God has given them the rudiments of thought and joy untroubled. Do not trouble their joy, don't harass them, don't deprive them of their happiness, don't work against God's intent. Man, do not pride yourself on superiority to animals; they are without sin, and you, with your greatness, defile the earth by your appearance on it, and leave the traces of your foulness after you - alas, it is true of almost every one of us! Love children especially, for they too are sinless like the angels; they live to soften and purify our hearts, as it were, to guide us."
Fyodor Dostoyevsky, The Brothers Karamazov