Here you are cross-examining the Lord Almighty — and you will understand nothing, not ever.
In context
11They came to her, and she said to them: “Listen to me, you rulers of the people of Bethulia. What you said in front of the people today was not straight, and neither was this oath you swore and set up between God and yourselves, promising to give the town over to our enemies unless within those days the Lord turns and helps you. 12And who are you, to put God on trial today, to stand in God’s place among the sons of men? 13Here you are cross-examining the Lord Almighty — and you will understand nothing, not ever. 14You cannot sound the bottom of a human heart, nor lay hold of the words of a human mind. Then how will you search out God, who made all of this, and know his mind and follow his reasoning? Never, my brothers! Do not provoke the Lord our God. 15For if he does not choose to help us in these five days, he has the authority to shelter us on whatever days he pleases — or to destroy us in front of our enemies.
