Approved workmen are not ashamed

 That points right to **2 Timothy 2:15**.

In the KJV, the full verse reads:

> "Study to shew thyself approved unto God, a workman that needeth not to be ashamed, rightly dividing the word of truth."

> 

It is such a powerful verse about diligence, putting in the honest effort, and being deeply grounded in what is true.