And Now, the Offer of Pardon

"For she [Jerusalem] has received from the Lord's hand
Double for all her iniquities."

Did you catch that, in Isaiah 40? The evil that has befallen Jerusalem is already double the evils she had committed. Here's a whole city full of sinners, and God somehow adds up every sin each of them had committed, and the corresponding punishment is still measurable, not infinite.

Not infinite.