This is more a question and validation of spiritual practice. Do you believe reincarnation is meant to teach us patience? Have you any personal experience where unresolved affairs from previous lives are being finalized in your present life? How about a premonition or an inkling that patience would be required, that it might mean no satisfactory resolve would be detected in this immediate incarnation but would come only after death has subdued the current personality? More profound is to think that behind these always changing human garbs are meaningful connections that reach across multiple incarnations and that God operates outside linear time as this the limited mortal mind understands it.