CCC 1264 Yet certain temporal consequences of sin remain in the baptized, such as suffering, illness, death, and such frailties inherent in life as weaknesses of character, and so on, as well as an inclination to sin that Tradition calls concupiscence, or metaphorically, “the tinder for sin” (fomes peccati); since concupiscence “is left for us to wrestle with, it cannot harm those who do not consent but manfully resist it by the grace of Jesus Christ.”¹ Indeed, “an athlete is not crowned unless he competes according to the rules.”²

1 Council of Trent (1546): DS 1515.
2 2 Tim 2:5.