11 And next? The centurion of the cohort, the guardian of the cross, cries out, Truly this was the Son of God. Creation is set free by the mediation of this Sin-offering; the very rocks lose their solidity and strength. They who had nailed Him to the cross confess that truly this is the Son of God. The outcome justifies the assertion. The Lord had said, Glorify Your Son. He had asserted, by that word Your, that He was God's Son not in name only, but in nature. Multitudes of us are sons of God; He is Son in another sense. For He is God's true and own Son, by origin and not by adoption, not by name only but in truth, born and not created. So, after He was glorified, that confession touched the truth; the centurion confessed Him the true Son of God, that no believer might doubt a fact which even the servant of His persecutors could not deny.
Source: On the Trinity (New Advent)