These thoughts on sola fide have been inspired by praying the Our Father as part of the Rosary. A couple other thoughts are worth adding.
This is not an either/or question - faith or works. No. Protestants fabricate a false dilemma when they frame things this way. We must have both. This is a good example, as an aside, of the problems with sola scriptura as well. Because Protestants have made sola fide into a grid by which they interpret the Bible. Obvious questions: "How do we know that this grid is valid? Why should we accept that this grid is the only acceptable one?" But sola scriptura cannot answer these questions. Why may we not say that we must lead holy lives and have faith (as the Catholic Church teaches)? Well, we certainly can - because both are certainly present in the Bible.