How do we know that conversion can be gradual?

In the sermon, it's noted that drifting from the truth often happens gradually through neglecting the means of God's grace, such as prayer, studying Scripture, and engaging in fellowship. This gradual progression indicates that many believers still hold to the core truth of salvation while becoming inconsistent in their walk. For instance, it's exemplified in the life of Peter, who, despite believing in Christ, erred in his actions. This understanding underscores the need for vigilance and community support in maintaining a steadfast faith. As we navigate our spiritual journey, it's essential to be aware of this tendency and actively seek the restoration of those who wander astray, fulfilling our role as instruments of God's grace.