Mystery vs. Secret: What's the Difference?
Open a modern English Bible and look up a passage that uses the Greek word mystērion. Depending on which translation you have, you may read "mystery" or you may read "secret." Are these the same thing? Not quite. The choice of English word carries significant implications for how the reader understands the text.
The Problem with "Secret"
In everyday English, a "secret" is something that is intentionally kept from others. If someone tells you a secret, the expectation is that you will not share it. The emphasis is on concealment and restricted access. A secret remains a secret precisely because it is not disclosed.
The biblical concept of mystērion is different. While a mystery in Scripture was indeed hidden for a time, the entire point is that it has now been revealed. The emphasis is on disclosure, not concealment. When Paul says "the mystery hidden for ages... has now been revealed" (Colossians 1:26), he is saying the secret is out. Calling this a "secret" in English can inadvertently suggest that the information is still locked away, which reverses the meaning.
The Problem with "Mystery"
On the other hand, the English word "mystery" has its own baggage. In common usage, a "mystery" is something unsolved — a detective novel, an unexplained event, an open question. This can suggest that biblical mysteries are things we cannot understand, which is also not what the text says. Paul claims to have insight into the mystery of Christ (Ephesians 3:4). It has been revealed, understood, and proclaimed.
The Best Way to Understand Mystērion
Neither "secret" nor "mystery" is a perfect translation. The biblical concept might be paraphrased as:
The emphasis falls on three stages: hidden → revealed → proclaimed. The word "secret" captures the first stage. The word "mystery" (in its technical biblical sense) captures all three. See What Does "Mystery" Mean in the Bible? for a fuller treatment of this definition.
Which Translations Use Which Word?
For a detailed translation comparison, see How Bible Translations Handle Mystērion. In brief:
- The ESV, NASB, and KJV consistently translate mystērion as "mystery."
- The NIV uses "mystery" in most places but occasionally uses "secret" or "secret wisdom" (e.g., 1 Corinthians 2:7).
- The NLT often paraphrases with "secret plan," "mysterious plan," or simply "plan."
Why It Matters
This is not just a debate about vocabulary. The translation choice affects how people understand the nature of the gospel, the role of the church, and the character of God. If the gospel is a "secret," it sounds exclusive and hidden. If the gospel is a "mystery now revealed," it sounds like an invitation to understand what God has done. The entire theology of proclamation — that the mystery must be declared to all nations (Romans 16:26) — depends on understanding that the revelation has happened and the message is meant to be shared.