How do we know Christ is the foundation of our faith?

In Ephesians 2:19-20, Paul illustrates how Christians are no longer strangers or foreigners but fellow citizens with the saints, built upon the foundation of the apostles and prophets, with Jesus Christ Himself as the cornerstone. This verse underscores that Christ is the source and substance of all apostolic teaching and gospel proclamation. Through His life, death, and resurrection, Jesus fulfills the promises made by the prophets, thus being the sole foundation upon which true faith stands. His supremacy as the Rock of Ages confirms that all faith must rest upon Him, assuring us of security and stability in salvation.