In this passage, the focus is on the necessity of developing certain spiritual qualities to avoid becoming spiritually nearsighted or blind. The qualities referenced earlier in the chapter include faith, goodness, knowledge, self-control, perseverance, godliness, mutual affection, and love. Lacking these attributes can lead to a kind of spiritual amnesia, where one forgets the profound change that has occurred through the forgiveness of sins. This forgetfulness can hinder spiritual growth and effectiveness in living out one's faith.
The verse encourages believers to actively pursue these virtues, as they are essential for a fruitful and meaningful Christian life. By remembering the cleansing from past sins, believers are motivated to live in a way that reflects their new identity in Christ. This continual growth helps maintain a clear vision of one's spiritual journey and purpose, preventing stagnation and encouraging a vibrant, active faith.