"Lest I slight any creature, I must also mention the domestic animals, the beasts and birds from whom I have learned. Job said long ago (35:11): «Who teacheth us more than the beasts of the earth, And maketh us wiser than the fowls of heaven?» Some of what I have learned from them I have written in my books, but I fear that I have not learned as much as I should have, for when I hear a dog bark, or a bird twitter, or a cock crow, I do not know whether they are thanking me for all I have told of them, or calling me to account."