What does it mean to say 'I am what I am by the grace of God'?

The statement 'I am what I am by the grace of God' underscores a believer's complete reliance on God's grace for their identity and spiritual standing. It reveals the transformative power of God's grace in the life of a sinner, highlighting that nothing about their worth or efforts contributes to their status before God. In 1 Corinthians 15:10, Paul illustrates that his labor in the ministry is fueled not by personal merit but by God's grace at work within him. This encapsulates the essence of the Reformed understanding of grace, where every aspect of a believer’s existence is a testament to God’s mercy. Thus, it affirms personal identity, purpose, and assurance of eternity in light of God’s sovereign grace.