 This “good-ought tie-up” is a theoretically attractive principle: whatever is good, ought to be done. If an action is good, then there must be reasons for doing it. If it is the best possible action, the reasons for doing it are conclusive, that is outweighing all other reasons for not doing it (or doing something else). Failing to do the best action cannot therefore be immune from blame or condemnation. Or, in other words, doing the best is always obligatory, never optional. Supererogation is impossible (Moore 1948, New 1974, Feldman 1986, Pybus 1982).