From the lukewarmness that is unavoidable, the saints themselves are not exempt; and this comprises all the failings that are committed by us without full consent, but merely from our natural frailty. Such are, for example, distractions at prayers, interior disquietudes, useless words, vain curiosity, the wish to appear, tastes in eating and drinking, the movements of concupiscence not instantly repressed, and such like. We ought to avoid these defects as much as we possibly can; but, owing to the weakness of our nature, caused by the infection of sin, it is impossible to avoid them altogether.
--St. Alphonsus Liguori, The Holy Eucharist
