Quote from : Introduction to the Devout Life Book

Even as a man just recovering from illness walks only so far as he is obliged to go, with a slow and weary step, so the converted sinner journeys along as far as God commands him but slowly and wearily, until he attains a spirit of true devotion, and then, like a sound man, he not only gets along, but he runs and leaps in the way of God's Commands, and hastens gladly along the paths of heavenly counsels and inspirations.