How do we know the importance of holiness in Christian life?

Holiness in the life of a believer is not merely a suggestion but an essential aspect of reflecting God's glory as revealed in Scripture. As Christians are called to be 'lights' in the world, their lives must evidence the transformative power of grace through demonstrated holiness. A failure to live in accordance with God's standards diminishes their witness and negates the effectiveness of the gospel they proclaim. The sanctifying work of the Holy Spirit empowers believers to grow in holiness and to reflect Christ’s character in their daily interactions, thereby glorifying God in all they do. In 1 Peter 1:15-16, believers are admonished to be holy as God is holy, indicating that it is foundational to their calling.