For the law was given through Moses; grace and truth came through Jesus Christ.
Law and grace is a theological theme from scripture. It is interesting how both John in John’s gospel account, and Paul handle this theme (see Paul’s treatment in Romans 7 for one example of his teaching on it).
The Law/Torah ends up being preparatory for the grace that would follow in Jesus. Essentially the Law is both directive, put in place for a new nation, Israel, certainly for individuals as well as the nation as a whole, and the Law was the means of convicting the people of their sin, that they are sinners, and thus the preparation needed for people to receive the needed salvation in Jesus. So the Law is important in its function and place. Another example from Paul, the Law a temporary guardian/disciplinarian to lead us to Christ (Galatians 3:24), and see the entire book of Galatians.
We may think this is not an issue for us today. After all, aren’t we Christians, and not Jews? How could we be followers of Moses rather than Christ? Inadvertently so, I’m afraid. It’s our tendency to think that the answer is to know more and do more, and that’s essentially the effect of the Law front and center. And again, it’s needed in its place to convict us as sinners (Romans 3:20).
This is a big subject, a glimpse of it here, hopefully. Christ brings the grace and truth which Moses evidently didn’t and indeed couldn’t. Truth follows grace, which I think is a hint that what we’re talking about is more than truth as knowledge, but truth in life, ultimately found in Jesus himself (John 14:6) and yes, in his death. By his death we die as well, so that our salvation not only from, but to and for is begun only in and through Jesus.