We have a God-Shaped-Hole in our hearts.

"What else does this craving, and this helplessness, proclaim but that there was once in man a true happiness, of which all that now remains is the empty print and trace? This he tries in vain to fill with everything around him, seeking in things that are not there the help he cannot find in those that are, though none can help, since this infinite abyss can be filled only with an infinite and immutable object; in other words by God himself."

"Faith is believing something nobody in their right mind would believe."
Mark Twain, Steve Allen, Archie Bunker.

Links:
Religious Quotes