702. Is the instinct of self-preservation a law of nature?
“Of course. Regardless of intelligence, it is given to all living creatures. In some it is purely mechanical, while in others it is associated with reason.”
703. Why has God given the instinct of self-preservation to all living creatures?
“God has given them the desire to live to carry out the designs of Providence. Furthermore, life is necessary for the improvement of beings. All living beings feel it instinctively, without understanding it.”