How do we know that Christ's coming was part of God's plan?

The New Testament emphasizes that Jesus' birth and ministry were the fulfillment of centuries of prophecy. Galatians 4:4 states that 'when the fullness of time had come, God sent forth His Son.' This phrase denotes the perfect timing aligned with God's divine purpose, affirming that every detail of Christ’s incarnation was orchestrated by God. The consistent use of 'it came to pass' in Scripture further reinforces the idea that God's promises, including sending a Savior, are executed precisely as He has ordained. Thus, the life of Christ demonstrates the divine plan of salvation that was set into motion long before His arrival.