Why then the law? It was added because of transgressions, until the offspring would come to whom the promise had been made; and it was ordained through angels by a mediator. Now a mediator involves more than one party; but God is one. (Galatians 3: 19-20)

The mediator - Moses - brought the law, with the help of angels.

The children of Israel had departed from the true path. They had transgressed - parabasis - or gone the wrong way.

The laws of Moses served to bring the travelers toward the true path and the right direction.

But now in Jesus we have a map and compass to guide us and no longer are in need of the law.

Mediation is no longer needed. We can approach God directly.

Above is The Ecstacy of St. Paul by Johann Liss.