Above all else, Francis de Sales had the heart of an apostle. True, he was intellectually gifted, he had an amiable and mild disposition that helped him make friends easily, and he was an effective writer and public speaker. But none of those advantages would have amounted to anything substantial in his mission had he not possessed a burning love for Christ and for his neighbor, a love that radiated and warmed those around him. This wellspring of charity (purely a gift of God’s grace) permeated all his actions and animated his every effort to spread the kingdom of Christ.
— from the book On a Mission: Lessons from St. Francis de Sales