Without any written religious texts, the secrets of Mithraism have died along with its followers.

由于没有任何书面宗教文本，密特拉教的秘密与其追随者一起消亡。

(spooky music) Mithraism as a religion was practiced by the Romans around 1,400 years ago, but has long gone extinct.

（幽灵般的音乐）密特拉教作为一种宗教在大约 1400 年前由罗马人信奉，但早已灭绝。

What's so fascinating about Mithraism is that its members were sworn to secrecy and gathered out of sight for ritual feasts.

密特拉教的迷人之处在于它的成员发誓要保密，并且聚集在看不见的地方参加仪式盛宴。

Because each member vowed to keep the rituals and beliefs of Mithraism secret from the rest of the world, much of what is known of this religion is based purely on speculation.

因为每个成员都发誓要对世界其他地方保密密特拉教的仪式和信仰，所以对这个宗教的大部分了解纯粹是基于猜测。