“We are aware of a difference between the pleasure we experience in our bodies and that we experience in our hearts. Physical pleasures, when we lack them, arouse in us an all consuming desire for them. As soon as we possess and devour them, though, our satisfaction turns into distaste. Pleasures of the spirit, on the other hand, seem distasteful when we do not possess them, but once they begin to be ours, our desire awakens. The more hungrily we seek them when we have begun to enjoy them, the more do we enjoy them even as we hunger for them.
With our bodies it is the desire that gives us pleasure, not the gratification of our desires with the spirit, as the desire is nothing, the fulfillment is all the more pleasing. Physical desire leads to satiety, and satiety leads to distaste for what we desired; spiritual desire produces satiety, and satiety leads to new desire.
The pleasure of the spirit increases our inner longing even while it satisfies us, since the more we savor it the more we perceive that there is something more to long for.” (St. Gregory the Great, Be Friends of God, p 15)