That's right. You don't. Stop trying to pretend you know things like that. You weren't there...you CAN'T know.
And as for reading the words the Holy Spirit inspired the writers of Scripture to say, I will trust that same Holy Spirit to teach me what God wants me to know. Remember, Peter said it was the UNLEARNED and UNSTABLE who wrest and twist Scripture to their own destruction. I will trust God over man.
This is not a limitation on ANY Catholic's ability to spout what they've been so thoroughly taught.
Do you suppose that he might have meant those INDIVIDUALS who think that they are able to interpret scripture on their own??????(they aren't)