Augustine, Confessions, Book 1, Chapter 1
Thou awakest us to delight in Thy praise; for Thou madest us for Thyself, and our heart is restless, until it repose in Thee.
Pascal, Pensées (425)
“What is it, then, that this desire and this inability proclaim to us, but that there was once in man a true happiness of which there now remain to him only the mark and empty trace, which he in vain tries to fill from all his surroundings, seeking from things absent the help he does not obtain in things present? But these are all inadequate, because the infinite abyss can only be filled by an infinite and immutable object, that is to say, only by God Himself. He only is our true good, and since we have forsaken him, it is a strange thing that there is nothing in nature which has not been serviceable in taking His place.
C. S. Lewis, Mere Christianity
God made us: invented us as a man invents an engine. A car is made to run on gasoline, and it would not run properly on anything else. Now God designed the human machine to run on Himself. He Himself is the fuel our spirits were designed to burn, or the food our spirits were designed to feed on. There is no other . . . . God cannot give us a happiness and peace apart from Himself, because it is not there. There is no such thing.”