There are a number of other scriptures that they like to pull out and apply to anyone doubting the sacred organization: "Are you leaning on your own understanding, brother?" (Prov. 3:5); "Are you becoming wise in your own eyes?" (Prov. 3:7, 26:12) "Are you running ahead of Jehovah?" (1 Sam. 15:23, 2 John 9) It becomes pointless to try and have a scriptural discussion with them because of their belief that whatever the current GB says comes from God and trumps everything else. No one else on the planet can speak for Jehovah. If you disagree with the org over anything—it does not matter what—then Satan has gotten a hold of you.
There really is no point in attempting to discuss anything with them. It's a waste of your, and ironically, their, time. They will not listen to whatever the issue is for you. The only issue for them is your loyalty to the org. Simpletons love such thinking.
There is that passage in Hebrews that discusses thinking ability, the "powers of discernment," in a positive way (5:14), but they would likely only apply that to the idea that all you have to do is discern the GB is God's sole mouthpiece, and there's no need to go beyond that—hardly the context of Hebrews chapter 5.