What this tells us is that initiates to the Mithraic Mysteries were given a profound understanding of the cosmic perspective and Rome's place in it. Historians and archaeologists tend to under play the importance of religion on ancient cultures, because they tend to be rationalists with little taste for spiritual truths, or they arrogantly define all spiritualism as superstition. But, all ancient cultures had to solve the cosmic perception problem before they could expect their cultures to survive through the generations. Roman Mithraic culture has to stand as one of the greatest developments in human theological accomplishment, as well as its well established legal system. Where Rome failed, all cultures eventually fail.
Success breeds pride, which results in arrogance and destruction.
That message come through very clearly in the Mithraic system. Theirs was a men only in a code of silence creed. The code of silence was necessary to disarm the uninitiated, and suppress the arrogance resulting from achievement. But, one can fight the bull for only so long, before material habits consume the soul. On this subject, there was probably never a more materialistic mundane culture that exceeded Roman culture.