Chapter 28 — Part III: The Decalogue — The Fifth Commandment
Section 21. Of these remedies the most efficacious is to form a just conception of the wickedness of murder. The enormity of this sin is manifest from many and weighty passages of Holy Scripture. So much does God abominate homicide that He declares in Holy Writ that of the very beast of the field He will exact vengeance for the life of man, commanding the beast that injures man to be put to death. And if (the Almighty) commanded man to have a horror of blood,' He did so for no other reason than to impress on his mind the obligation of entirely refraining, both in act and desire, from the enormity of homicide.