And the reason that the Lord willed that he should at first be called otherwise, was that from the change itself of the name, a mystery might be conveyed to us. Peter then in Latin or in Greek means the same thing as Cephas in Hebrew, and in each language the name is drawn from, a stone.
Nor can it be doubted that is the rock of which Paul spoke, “And this rock was Christ.” [1 Cor 10:4] For as Christ was the true light, and allowed also that the Apostles should be called the light of the world, [Matt 5:14] so also to Simon, who believed on the rock Christ, He gave the name of Rock.
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).