52:4.9

On many worlds it develops that the planet is not made ready for a bestowal Son by one magisterial mission; in that event there will be a second, even a succession of Magisterial Sons, each of whom will advance the races from one dispensation to another until the planet is made ready for the gift of the bestowal Son. On the second and subsequent missions the Magisterial Sons may or may not be incarnated. But no matter how many Magisterial Sons may appear—and they may also come as such after the bestowal Son—the advent of each one marks the end of one dispensation and the beginning of another.