How do we know that grace is not received in vain?

In 2 Corinthians 6:1, Paul urges gospel ministers to not receive the grace of God in vain, meaning they should not neglect the gifts and responsibilities that come with it. This grace includes not only salvation but specifically the gifts given for ministry work. Paul emphasizes that God qualifies ministers with His grace, and it must be actively employed in the service of sharing the gospel. The implication is that genuine ministry recognizes the importance of stewardship over the gifts received, thus avoiding any emptiness in their effectiveness. Therefore, ministers must diligently work, ensuring that their calling is reflected in their actions and service.