It must be observed that there are two kinds of tepidity or lukewarmness: the one unavoidable, the other avoidable.
I.---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.
We ought, indeed, to detest them after committing them, because they are displeasing to God; but, as we remarked in the preceding chapter, we ought to beware of making them a subject of alarm or disquietude. St. Francis de Sales writes as follows: "All such thoughts as create disquietude are not from God, Who is the Prince of peace; but they proceed always from the devil, or from self-love, or from the good opinion which we have of ourselves." [Lettre 51.] Such thoughts, therefore, as disturb us must be straightway rejected, and made no account of.
It was said also by the same Saint, with regard to indeliberate faults, that as they were involuntarily committed, so are they cancelled involuntarily. An act of sorrow, an act of love, is sufficient to cancel them. The Venerable Sister Mary Crucified, a Benedictine nun, saw once a globe of fire, on which a number of straws were cast, and were all forthwith reduced to ashes. She was given to understand by this figure that one act of Divine love, made with fervor, destroys all the defects that we may have in our soul. The same effect is produced by the holy Communion; according to what we find in the Council of Trent, where the Eucharist is called "an antidote by which we are freed from daily faults." Thus the like faults, though they are indeed faults, do not hinder perfection---that is, our advancing toward perfection because in the present life no one attains perfection before he arrives at the Kingdom of the blessed.
II. ---The tepidity, then, that does hinder perfection is that tepidity which is avoidable when a person commits deliberate venial faults; because all these faults committed with open eyes can effectually be avoided by the Divine grace, even in the present life. Wherefore St. Teresa said: "May God deliver you from deliberate sin, however small it may be." [Way of Per. ch. 42.] Such, for example, are willful untruths, little detractions, imprecations, expressions of anger, derisions of one's neighbor, cutting words, speeches of self-esteem, animosities nourished in the heart, inordinate attachments to persons of a different sex. "These are a sort of worm" (wrote the same Saint) "which is not detected before it has eaten into the virtues." [Inter. Castle, ch. 3.] Hence, in another place, the Saint gave this admonition: "By means of small things the devil goes about making holes for great things to enter." [Found. ch. 29.]
We should therefore tremble at such deliberate faults; since they cause God to close His hands from bestowing upon us His clearer lights and stronger helps, and they deprive us of spiritual sweetnesses; and the result of them is to make the soul perform all spiritual exercises with great weariness and pain; and so, in course of time, she begins to leave off prayer, Communions, visits to the Blessed Sacrament, and novenas; and, in fine, she will probably leave off all, as has not infrequently been the case with many unhappy souls.
This is the meaning of that threat which our Lord makes to the tepid: Thou art neither cold nor hot; I would thou wert cold or hot: but because thou art lukewarm . . . I will begin to vomit thee out of My mouth. [Apoc. iii. 15, 16.] How wonderful! He says, I would thou wert cold! What! and is it better to be cold, that is, deprived of grace, than to be tepid?