This morning I was reading MacArthur's "Drawing Near" devotional and I came across this great nugget of information:
The Greek word translated “sincere” (pure in ESV) in verse 10 speaks of genuineness and authenticity. It literally means “without wax” and is an allusion to the practice of inspecting pottery by holding it up to the sunlight. In ancient times pottery often cracked during the firing process. Rather than discarding cracked pieces, dishonest dealers often filled the cracks with wax and sold them to unsuspecting customers. Holding a pot up to the sunlight revealed any flaws and protected the customer from a bad purchase.
Following that analogy, Biblical integrity requires that you be without wax, having no hypocrisy or secret sins that show up when you’re under pressure or facing temptation.
My question is...
How would I have found this information on my own?Lets say I was preaching on this verse and wasn't reading this in a devotional. I would want this type of great illustration & information to teach to my congregation.
I tried looking in LN, Strongs, and others... I did a search for the word "pure" and even the Lemma for this word, some of my Lexicons (BDAG, TDNT, etc.) alluded to the "holding it up to sunlight" part, but gave no information as to the "cracked pottery filled with wax"... which makes the "holding up to sunlight" make much more sense and gives a very memorable word picture as well.
So how would I have found this manually? Any great resources that are great for pointing this stuff out to a guy who doesn't want to read through his entire library after searching for the lemma? Busy pastor hoping not to swim through thousands of recourses.

Any wisdom would be appreciated...