"I do not frustrate the grace of God: for if righteousness come by the law, then Christ is dead in vain."
This is one of those verses that is powerful and direct. The law, Adonai's Torah, does not make one righteous, only Yeshua, the Living Torah can do that. Being Messianic, I interact with a lot of Torah Observers, who sometimes, tend to idolize Torah. It appears, at times, that Levitical Torah is the most important thing, but here, apostle Paul, Rabbi Sh'aul, who lived Torah, declares, that God's grace is frustrated if Torah brings righteousness. HalleluYAH, Yeshua, the Mashiach, the Living Torah, He alone can make righteous, and He alone, will I serve or be bound to.
