Because God is not bound by space or time, the desire for God is unlike desire for things in this world. When, for example, we have yearned for food or drink and receive what we have longed for, our desire ceases. Often our enjoyment falls short of our expectations, and in the very moment of satisfaction, we begin to desire something else. But our yearning to see God will be satisfied only by knowing God more fully and more intimately. The more we know, the more we desire to know.
Robert Louis Wilkin, summarizing the thought of Gregory of Nyssa, a 4th century theologian, in The Spirit of Early Christian Thought (Yale, 2003), 301.