Again, Paul looks at the entire period of redemptive history and explains God’s timetable in the giving of the promise, the law, and the coming of Christ, without reference to individuals living during each of those periods. Using shorthand, he identifies faith with the coming of Christ, the object of faith.
So stubborn is the human heart that it will never abandon hope in its own ability to please God until the way is shut up and barred with an unmovable bar and every possible way round is blocked. For although men know that they have sinned in one area of their lives, they think that they can make up for it in another area of their lives, but the law condemns every part. But even though this is so clear, we refuse to recognise our state until the Spirit brings under conviction.
But why does Paul say that the law was in effect only until the coming of Christ? Don’t men still need the law to convict them of sin after the coming of Christ? Certainly, they do. Paul’s language is not intended to teach that the law of God is not operating today, but only that the covenant made at Sinai has ended. Since creation all have been under the law of God. For the covenant of works made with Adam is still in force as is evident from the fact that its penalty, death, is still operating. The ceremonial law is also done away with, for the things prefigured by those ceremonies have now all been fulfilled with the coming of the Son of God. He is the fulfilment of every symbol attached to the Mosaic law, and it would not be fitting for the symbol to continue when the reality has come to which the symbol points.
What was the relationship between the promise and the law of Moses prior to the coming of Christ? They coexisted, but in a state that always suggested that God had not finished the implementation of his plan. During that time the promise was to some extent eclipsed by the law. Those with faith longed for the coming of the Messiah who would fulfil the Abrahamic promises. It was therefore not right that this situation should go on forever, and the law had to come to an end as a formal covenant. It would have been confusing for both law and promised to continue to exist together. When the law came to an end and the promise arrived, it was clear that all that is essential is embodied in the promise.