Proponents of numerous recent theories of a person's good hold that a plausible account of the good for a person must satisfy existence internalism. Yet little direct defense has been given for this position. I argue that the principal intuition behind internalism supports a stronger version of the thesis than it might appear--one that effects a "double link" to motivation. I then identify and develop the main arguments that have been or might be given in support of internalism about a (...) person's good, showing how these arguments support this stronger version of internalism. (shrink)