“As daylight waxes, we, gazing into a mirror, see more plainly the soils and stains upon our face; and even so as the interior light of the Holy Spirit enlightens our conscience, we see more distinctly the sins, inclinations and imperfections which hinder our progress towards real devotion. And the selfsame light which shows us these blots and stains, kindles in us the desire to be cleansed and purged therefrom.

You will find then, my child, that besides the mortal sins and their affections from which your soul has already been purged, you are beset by sundry inclinations and tendencies to venial sin; mind, I do not say you will find venial sins, but the inclination and tendency to them. Now, one is quite different from the other. We can never be altogether free from venial sin,--at least not until after a very long persistence in this purity; but we can be without any affection for venial sin. It is altogether one thing to have said something unimportant not strictly true, out of carelessness or liveliness, and quite a different matter to take pleasure in lying, and in the habitual practice thereof. But I tell you that you must purify your soul from all inclination to venial sin;--that is to say, you must not voluntarily retain any deliberate intention of permitting yourself to commit any venial sin whatever.”  St. Francis de Sales, Introduction to the Devout Life