In the successive incarnations of an individual soul, there is not only a thread of continuity and identity manifested in personal memory and revived in the case of advanced souls, but there is also an uninterrupted reign of the law of cause and effect through the persistence and operation of karma. The successive incarnations with all their particulars are closely and unfailingly determined by rational law, making it possible for the individual soul to mold its future through wise and intelligent action. The actions of past lives determine the conditions and circumstances of the present life, and the actions of the present life have their share in determining the conditions and circumstances of future lives. Successive incarnations of the individual soul yield their full significance only in the light of the operation of the law of karma.
Meher Baba Discourses, page 327