St. Augustine: Humility is the foundation of all the virtues...
Humility is the foundation of all the virtues; therefore, in a soul where it does not exist there can be no true virtue, but the mere appearance only.
In like manner, it is the most proper disposition for all celestial gifts. And, finally, it is so necessary to perfection, that of all the ways to reach it, the first is humility; the second, humility; the third, humility. And, if the question were repeated a hundred times. I should always give the same answer.
St. Augustine