"Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth."
That's the King James for 2Timothy 2:15, and people often bring this up as a justification for their fascination with the Old Covenant, or to reinforce their point that you have to earn favor.
There's so much Scriptural bastardry in how we've taught this verse. I'm really quite embarrassed.
First, "Study" in 1611, when King Jimmy commissioned his translation meant what the Greek word σπουδάζω means. However, in 21st Century English, the word means "be diligent," or "do your best." It has nothing to do with academic study.
I'm very much in favor of studying the Bible. But this verse is not even remotely talking about that. Illustrations (like the one here) that tie this verse to a picture of a Bible are seriously missing the point of this scripture!
Second, παρίστημι, "show yourself" (or worse, "shew thyself") in 1611, is more about "Show what you're really like," not "work for your approval."
"Approved" speaks of a coin that's been demonstrated to be real silver, not lead or tin: this is the real thing. Again, "Show what you're really like."
So the whole thing is more about, "Be careful to let who you really are show." The idea of "Don't hide God's delight in you" is there as well.
We could go on.
This is probably why the NIV (the "Nearly Inspired Version" lol) translates it as "Do your best to present yourself to God as one approved, a worker who does not need to be ashamed and who correctly handles the word of truth."
For decades, this verse was used as a club, justifying church rules and expectations, requiring my suffering sweat (or my academic study) in order to be acceptable.
Don't let people use the Bible as a club. It's a love letter from a lovesick Daddy who wants his kids back. Anybody that uses Scripture to control others is a good person to pray for, but not a good person to follow.