The repertory is the guide by which you can complete the logical circle of homeopathy and derive a proper remedy. The symptoms of the provings are collected, indexed and summarized so that you may reverse the process and find the simillimum that best matches your patient.
The key logical element here is the law that if you can go from health and a remedy to a drug picture then you can go from a drug picture and a remedy to health.
The repertory is not meant for use in those cases where there are clear indications for the simillimum. -- von Boenninghausen, Therapeutic Pocket Book