A. They are simple; all of them are comprised in one fundamental and single precept.
Q. What is that precept?
A. It is self-preservation.
Q. Is not happiness also a precept of the law of nature?
A. Yes: but as happiness is an accidental state, resulting only from the development of man's faculties and his social system, it is not the immediate and direct object of nature; it is in some measure, a superfluity annexed to the necessary and fundamental object of preservation.
Q. How does nature order man to preserve himself?
A. By two powerful and involuntary sensations, which it has attached, as two guides, two guardian Geniuses to all his actions: the one a sensation of pain, by which it admonishes him of, and deters him from, everything that tends to destroy him; the other, a sensation of pleasure, by which it attracts and carries him towards everything that tends to his preservation and the development of his existence.
Q. Pleasure, then, is not an evil, a sin, as casuists pretend?
A. No, only inasmuch as it tends to destroy life and health which, by the avowal of those same casuists, we derive from God himself.
Q. Is pleasure the principal object of our existence, as some philosophers have asserted?