Hi Sue,
I don't think it's obvious. That's why I'm trying to work through it with you and asking you questions.
It's not agree with me or you're mistaken. It's agree with proper reasoning or one is mistaken.
Suppose someone believed that 1+1=3. Now suppose they came in here and started to argue a calculus problem. Would we engage them in an argument about calculus or would we point out that the premise, 1+1=3, of their argument is wrong? It doesnt matter how well or adamantly they argued. The argument would be wrong because they aren't reasoning properly in the premise. 1+1 doesnt equal 3. So, no matter how passionately they argued the calculus problem it will be wrong because their premise is irrational or no proper reasoning
And Now you bring in 'proper reasoning or it's wrong'. And who, exactly is supposed to be possessing 'proper reasoning' you or Scripture. God's Word Is my authority not your interpretation of it.
Your example of 1+1=3 is faulty -- one can use our fingers to to determine that 1+1 = 2. Math is precise.