How do we know Jesus Christ is the one Isaiah saw on the throne?

John 12:41 provides crucial clarity by stating, 'These things said Isaiah, when he saw his glory, and spake of him.' This indicates that the Lord Isaiah witnessed in his vision was indeed Christ. Throughout Scripture, we encounter instances where the Old Testament appearances of God are understood to be the pre-incarnate Christ, affirming His eternal existence and redemptive work. Isaiah’s vision serves as a profound testimony to the centrality of Christ in God's overarching plan of salvation, confirming His sovereignty and the holy nature of His ministry among His people.