Our greatest fault is that we wish to serve God in our way, not in His way- according to our will, not according to His will. When He wishes us to be sick, we wish to be well; when He desires us to serve Him by sufferings, we desire to serve Him by works; when He wishes us to exercise charity, we wish to exercise humility; when He seeks from us resignation, we wish for devotion, a spirit of prayer or some other virtue. And this is not because the things we desire may be more pleasing to Him, but because they are more to our taste. This is certainly the greatest obstacle we can raise to our own perfection, for it is beyond doubt that if we were to wish to be Saints according to our own will, we shall never be so at all. To be truly a Saint, it is necessary to be one according to the will of God.
If you have not read his Introduction to the Devout Life, do yourself a favor and do so. It's not for nothing he's a Doctor of the Universal Church!
