What does it mean to be grafted into Christ?

The biblical metaphor of grafting comes from agriculture, representing how believers are spiritually joined to Christ, much like a branch joins to a vine. This concept is thoroughly explained in John 15, where Jesus describes Himself as the true vine and His followers as branches. Those who are truly saved are integrated into Christ, receiving life and nourishment from Him. This union is vital for spiritual growth and is indicative of the believer's eternal security, as separation from Christ is not an option for those who are genuinely His.