From TSL Encyclopedia
The mystery of the Fifteenth Rosary is the mystery of the surrender of that Christ that you become.
In her dictation given March 19, 1980, Mother Mary said:
The Fourteenth Rosary and all of the rosaries preceding it are preparatory initiations for the putting into the flame of the unbalanced karma, the misqualified energies of life, the unwanted substances, and all that is unreal. These rosaries are sacred keys to the initiations of Christhood whereby you, very presently and with haste, may balance fifty-one percent of your karma and remain in life the presence, lo, the living presence of your own blessed Christ Self....
The mystery of the Fifteenth Rosary is the mystery of the surrender of that Christ that you become. It is not an automatic surrender, for some disciples may fulfill the fourteen stations and become that Christ and yet desire to possess that Christ, to be that Christ, to enjoy that Christhood and with it to yet pursue some of the private paths which indeed may increase attainment but may not increase the path of Christhood for others.
Thus you see that when all other surrenders are in the valleys behind you and you stand on the mount of that transfiguration and you stand in the glory of Easter morn, you recognize that from the mount of transfiguration unto the mount of the Holy of Holies of the Resurrected Self there is a unique path to be walked. It is the surrender of that Christhood that you have attained.
- Pearls of Wisdom, vol. 23, no. 27.