And inasmuch as desire is never ended, it is never satisfied in this life, but the more the soul loves the less she seems to herself to love. Thus is holy desire, which is founded in love, exercised, and with this desire the eye weeps. But when the soul is separated from the body and has reached Me, her End, she does not on that account abandon desire, so as to no longer yearn for Me or love her neighbor, for love has entered into her like a woman bearing the fruits of all other virtues. It is true that suffering is over and ended, as I have said to you, for the soul that desires Me possesses Me in very truth, without any fear of ever losing that which she has so long desired; but, in this way, hunger is kept up, because those who are hungry are satisfied, and as soon as they are satisfied hunger again; in this way their satiety is without disgust, and their hunger without suffering, for, in Me, no perfection is wanting.
Thus is your desire infinite, otherwise it would be worth nothing, nor would any virtue of yours have any life if you served Me with anything finite. For I, who am the Infinite God, wish to be served by you with infinite service, and the only infinite thing you possess is the affection and desire of your souls.
The Dialogue, St. Catherine of Siena