It is sometimes asked, why should the Overself, through its grace, interfere with the workings of its own law of consequences? Why should it be able to set the karma of a man at naught? If the recurrence of karma is an eternal law, how can any power ever break it or interfere with its working? The answer is that the Overself does not violate the law of consequences at any time. If, through a man's own efforts he modifies its effects upon him in a particular instance, or if the same is brought about by the manifestation of Grace, everything is still done within that law--for it must not be forgotten that the allotment selected for a particular incarnation does not exhaust the whole store of karma existing in a man's record. There is always very much more than a single earth-life's allotment. What happens is that a piece of good karma is brought into manifestation alongside of the bad karma, and of such a nature and at such a time as completely to neutralize it, if its eradication is to be the result, or partially to neutralize it, if its modification is to be the ended result. Thus the same law still continues to operate, but there is a change in the result of its operation.
-- Notebooks Category 9: From Birth to Rebirth > Chapter 3: Laws and Patterns of Experience > # 574