Introduction to the Devout Life Treatise on the Love of God 

Francis de Sales (21 August 1567 – 28 December 1622) was a Bishop of Geneva and is honored as a saint in the Catholic Church. He became noted for his deep faith and his gentle approach to the religious divisions in his land resulting from the Protestant Reformation. He is known also for his writings on the topic of spiritual direction and spiritual formation, particularly the Introduction to the Devout Life and the Treatise on the Love of God.    

Francis de Sales was beatified in 1661 by Pope Alexander VII, who then canonized him four years later. He was declared a Doctor of the Church by Pope Pius IX in 1877.

In 1923, Pope Pius XI proclaimed him a patron of writers and journalists, because he made extensive use of broadsheets and books both in spiritual direction and in his efforts to convert the Calvinists of the region.  St. Francis developed a sign language in order to teach a deaf man about God. Because of this, he is the patron saint of the deaf.

Source: https://en.wikipedia.org/wiki/Francis_de_Sales

"No indeed, my child, the devotion which is true hinders nothing, but on the contrary it perfects everything; and that which runs counter to the rightful vocation of any one is, you may be sure, a spurious devotion.

Aristotle says that the bee sucks honey from flowers without damaging them, leaving them as whole and fresh as it found them;—but true devotion does better still, for it not only hinders no manner of vocation or duty, but, contrariwise, it adorns and beautifies all.

Throw precious 10 stones into honey, and each will grow more brilliant according to its several colour:—and in like manner everybody fulfils his special calling better when subject to the influence of devotion:—family duties are lighter, married love truer, service to our King more faithful, every kind of occupation more acceptable and better performed where that is the guide."  

Excerpt: Introduction to the Devout Life