How do we know the doctrine of Christ's servanthood is true?

The doctrine that Christ became a servant is affirmed in both Philippians chapter 2 and the Gospel of John. In Philippians 2:5-8, we see the call for believers to adopt the same mindset as Christ, who, though he was in the form of God, took on the form of a servant. In John 13, Jesus exemplified this by washing his disciples' feet, a task reserved for the lowest servant. These passages collectively reinforce the truth that the Son of God embraced servanthood as part of his mission, emphasizing his love and humility in fulfilling the will of the Father for our salvation.