A Course In Miracles gives the answer over and over again in its text. In section VIII of of chapter 15 in paragraph 2 it is written: "Hear Him gladly, and learn of Him that you have need of no special relationships at all. You seek in them what you have thrown away. And through them you will never learn the value of what you have cast aside, but still desire it with all you heart."
Jesus tells us in Matthew 22:37 "'Love the Lord your God with all your heart and with all your soul and with all your mind."
What we crave, deep down, is the oneness with God's creation of which we are a part. As is taught in 12 step problems in step one, we recognize and acknowledge that our lives are unmanageable, in step two that there is a power greater than ourselves that can restore us to sanity, and in step three we make a decision to turn our will and our lives over to our Higher Power as we understand it.