How do we know divine grace can decline in Christians?

The essence of divine grace remains unchanged in a believer's life, but its exercise can weaken, leading to a state of spiritual declension. As Winslow illustrates, the believer may maintain a sound understanding of truth while experiencing a lack of spiritual enjoyment. This dissonance often reveals itself in a heart that lacks fervor and a life that doesn't reflect true holiness. Therefore, it is crucial for Christians to periodically examine their hearts, as the presence of divine grace does not guarantee the vitality of their faith or the active power of the Holy Spirit in their lives.