It would seem that, according to the common view of `good', there are occasions in which an individual's sacrifice of his own good on the whole, according to the most rational conception of it that he can form, would apparently realise greater good for others. Whether, indeed, such a sacrifice is ever really required, and whether, if so, it is truly reasonable for the individual to sacrifice his own good on the whole, are among the profoundest questions of ethics: and I shall carefully consider them in subsequent chapters (especially Book iii. chap. xiv.). I here only desire to avoid any prejudgment of these questions in my definition of `my own good'.