It is a mystery that some important events are easily forgotten, while others that are utterly trivial are amplified by constant mental repetition. If questioned, the memory would be unable to explain itself. The result is often confusing, and even scrutiny cannot overcome its tendency to arbitrarily select what stays and what goes. A man must, at the very least, be the master of his past life; but it seems obvious that, without making an effort to tame his memory, he will not be.