In what way was the Law of Moses "a good thing whose purpose had now been accomplished"?

I came across this quote from NT Wright: > The Torah [the Law of Moses] is given for a specific period of time, > and is then set aside—not because it was a bad thing now happily > abolished, but because it was a good thing whose purpose had now been > accomplished. I'd like to see this fleshed out in more detail. In what way is this true, according to Wright or others that hold this view?