It would be good if some of us questioning this had a copy of Fire Within, beginning on pg. 133 which points out the difference between attachments and healthy detachment. Fr. Dubay quoted St. Paul who taught that "whatever we eat or drink, or whatever we do, should reflect our thanksgiving and give honor and glory to God. That in a nutshell is the beautiful wording we hear in Eucharistic Prayer IV:
And that we might live “no longer for ourselves” but for HIM, He sent the Holy Spirit from you Father as His first gift to those who believe, to complete His work on earth and bring us to the fullness of grace.
Our mortification and self-denial should be chosen specifically to correct the wrong use of our five senses when our pleasures persist as attachments that have no reference to God, and are truly inordinate. Jesus warned us to “cut off our arm” and “pluck out our eye” if it leads us to sin. If our eye beholds beauty in its countless worthy forms and we orient our day to God with our morning offering, then this is a good thing, no?
But if our eye seeks deliberately to view objects offensive to God, and becomes an attachment we would prefer not to give up, then you can readily see how this will need radical self denial. I once had an inordinate attachment to fine clothing, and the harm it did me was to mentally preen myself in front of others like the peacock, and in doing so, often failed to listen to what they said to me. I was too busy inwardly admiring myself.

I tried to correct it on my own many times, but without success. Finally I took Jesus’s words to heart and “cut it off” completely, and wore a uniform to abstain from the temptation for about 6 months. It was a wonderful fast, and at the end, I was so purified of this that I never again suffered from this temptation.
It is a small example, and surely many of you can share examples of your own, since each of us has specific temptations according to our sinful nature that need to be purified. We need to have well-ordered choices in the motive of our penance, or else they are just empty efforts that do not produce good spiritual fruit. Our sinful motivation is never hidden from God, though it may be hidden from our very selves until He brings it to our attention through prayer and inspires us to work toward detachment. Afterwards, we may then use many of the world’s goods with wisdom and right reason ordered to God, without being enslaved.
May I also point out that St. Therese and other ‘victim souls’ took upon themselves many acts of self denial and penance specifically for others, to win for them the graces they need. Belief that we must do likewise or else we cannot become a saint, is somewhat disordered, unless we have the same motive as theirs: heroic love for souls and willingness to sacrifice oneself on their behalf.