Who was the astrologer?

One day a stranger comes to seek the advice of the astrologer. He wants to discover the identity of the man who once attacked him and left him for dead. The astrologer realizes straight away that he himself was the attacker. Ever since that fateful day, he's been wracked by guilt, believing that the man he'd attacked all those years ago had died. But now that he knows that the man survived after all, a huge weight has suddenly been lifted from the astrologer's shoulders. He can now say with confidence that the man who beat the stranger and pushed him down a well has died; he's really not the same person that he once was. As well as being able to reassure the stranger, the astrologer has, at long last, achieved the peace of mind which had eluded him for so long.