Catechism of the Catholic Church §594 — excerpt
Jesus performed acts, such as pardoning sins, that manifested him to be the Saviour God himself (cf Jn 5:16-18). Certain Jews, who did not recognize God made man (cf Jn 1:14), saw in him only a man who made himself God (Jn 10:33), and judged him as a blasphemer.
This translation is under copyright, so only the cited words are quoted here. Follow the link for the full text. Translation: English translation of the Catechism of the Catholic Church, 2nd ed. (Libreria Editrice Vaticana), as posted at vatican.va.