Chapter 19 — Part II: The Sacraments — Penance
Section 28. This Sacrament May Be Repeated — The faithful should be instructed not only that Penance is to be numbered among the Sacraments, but that it is one of the Sacraments which may be repeated. To Peter, who had asked whether pardon could be given to sin seven times, our Lord replied: I say not to thee, till seven times; but till seventy times seven.