John Chrysostom

And the Centurion too then glorified God, saying, "Truly this was a righteous man. And the multitudes that came together to that sight, returned beating their breasts." So great was the power of the crucified, that after so many mockings, and scoffs, and jeers, both the centurion was moved to compunction, and the people. And some say that there is also a martyrdom of this centurion, who after these things grew to manhood in the faith.

Homily on the Gospel of Matthew 88 ↗

Theophylact of Ohrid

Now when the centurion, and they that were with him keeping watch over Jesus, saw the earthquake, and those things that were done, they feared greatly, saying, Truly this was the Son of God. The Gentile centurion and those with him believed because of these great signs, but the Jews, who had clearly heard the prophets and the law, remained unbelieving - such an evil thing is malice! And this centurion later bore witness to Christ.

Commentary on Matthew ↗

Augustine of Hippo

It is no contradiction here that Matthew says, that The centurion and they that were with him, watching Jesus, feared when they saw the earthquake, and the things that were done; while Luke says, that he wondered at the giving up the ghost with a loud voice. For when Matthew adds, the things that were done, this gives full scope for Luke's expression, that he wondered at the Lord's death, for this among the rest was wonderful.

Catena Aurea by Aquinas ↗

Jerome

But the centurion and those who were with him, guarding Jesus, when they saw the earthquake and the things that were happening, were very afraid, saying: Truly, this was the Son of God. In another Gospel, after the earthquake, a more clear cause of the centurion's miracle is explained: when he saw him breathe his last, he said: Truly, this was the Son of God. For no one has the power to dismiss the spirit except the one who is the creator of souls. …

Commentary on Matthew ↗

Leo the Great

From this example then of the Centurion let the substance of the earth tremble in the punishment of its Redeemer, let the rocks of unbelieving minds be rent, and those who were pent up in these sepulchres of mortality leap forth, bursting the bonds that would detain them; and let them show themselves in the Holy City, i. e. the Church of God, as signs of the Resurrection to come; and thus let that take place in the heart, which we must believe takes place in the body.

Catena Aurea by Aquinas ↗