This is one of the two chapters of Proverbs not attributed to Solomon. It contains the words of an otherwise unknown guy named Agur (:1).
After a short discussion about his own shortcomings (:2-3) and the awesomeness of God, Agur speaks of God (:4-5) and his Word (:5-6). While we know the writer was not thinking about the Bible as we have it today, he did have a clear sense of God’s message to man.
This verse speaks of God’s word being “flawless.” That carries with it the idea of being “refined/ purified by fire. The writer notes that everything God says is tried and true (purified and flawless). He can back up what He says. As I learned somewhere along the way, “God can back up His talkie-talkie with His walkie-walkie!”
Agur also adds that God, Himself, is a “shield” to protect those who need and choose to “take refuge in him.” What Agur is thinking here is pretty simple and basic. When we are ready to put our confidence in what God says, He has the power and will protect and watch over us!