How do we know Christ's sufficiency is true?

The truth of Christ's sufficiency is grounded in biblical revelation and the testimony of believers throughout history. Passages such as Hebrews 11 show heroes of faith who recognized the sufficiency of God's promises. Moreover, Christ Himself claims to be the way, the truth, and the life (John 14:6), indicating that salvation and all we need for living a godly life are found in Him alone. The historical experiences of believers who testify to His faithfulness further affirm this doctrine. They often recount how turning fully to Christ provides peace, assurance, and direction amidst trials, which indicates that His grace is sufficient for every need.