From St Francis de Sales, in his treatise on the Love of God:
This is the Christian life. Do we live it?
Oh, how sweet and desirable is the yoke of the law you impose on us, O Lord, who love us so much and are worthy of our love! … Oh Lord, who love us so much and are worthy of our love! The heart that loves you loves your commandments, and the more difficult they are, the most sweetness and delight it finds in them, as an added opportunity to please you more perfectly and to render you greater honor. So it is when you teach your commandments, the heart of a lover pours forth hymns of gladness… And finds more comfort and refreshment in the weight of your precepts than in anything else in this mortal life.