Why is the grace of God considered the 'good part'?

God's grace is the 'good part' because it is a profound expression of His favor and truth, which sustains believers through all circumstances. Unlike material things that are temporary and can be lost, God's grace provides a lasting inheritance that cannot be taken away. It is the ultimate source of joy and peace, applicable in every season of life—good times and bad, in health and sickness. Recognizing the eternal value of God's grace allows believers to prioritize their spiritual lives and nurture a deeper relationship with Christ, which is indeed the only thing truly needful.