How do we know Jesus is the sure foundation for Christians?

In Matthew 16:18, Jesus identifies Himself as the rock upon which His church will be built, stating, 'And I say also unto thee, That thou art Peter, and upon this rock I will build my church; and the gates of hell shall not prevail against it.' This indicates that in Christ, believers have a solid foundation that cannot be shaken. Isaiah 28:16 further affirms this by declaring, 'I lay in Zion for a foundation a stone, a tried stone, a precious cornerstone, a sure foundation.' This signifies that all who trust in Christ are secure in their salvation and can rest assured in His promises.