Saint Francis de Sales 
Introduction to the Devout Life [EPUB ebook] 

Almost all those who have written concerning the devout life have had chiefly in view persons who have altogether quitted the world; or at any rate they have taught a manner of devotion which would lead to such total retirement. But my object is to teach those who are living in their own households, and whose calling obliges them to a social life, so far as externals are concerned. And so I have shown them that a true stedfast soul may live in the world untainted by worldly breath, finding a well-spring of holy piety amid the bitter waves of society, and hovering amid the flames of earthly lusts without singeing the wings of its devout life.