Why is holiness crucial for Christians?

Holiness is essential for Christians as it encompasses the character and lifestyle of a believer transformed by the grace of God. As stated in John 17:19, Christ's prayer highlights the need for His followers to be sanctified, meaning they should strive for purity in thought, word, and deed. The pursuit of holiness not only validates one's faith but also enables Christians to experience full joy and readiness for life in heaven. Without holiness, the enjoyment and fulfillment of eternal life with God would be hindered, making it imperative for believers to seek a holy life that pleases God.