This remission of all sins is not limited to past sins only, but to all sins—past, present, and future. If it were not so, then justification would have to be repeated over and over again, and the imputation of the righteousness of Christ would be lowered to the level of the animal sacrifices of the old covenant. Therefore it has to be offered over and over again for the continued presence of sin.
When God promised His people that He would judge their sin, and when He kept His promise and judged them, He was acting in accord with His character. He is a just God, and only someone who is unjust would allow people to commit crimes and acquit them indefinitely. God’s wrath against sin arises from His goodness and holiness.