“There is a void in our heart which all creatures united would be unable to fill. God alone can fill it; for He is our beginning and our end. The possession of God fills up this void and makes us happy. The privation of God leaves in us this void and is the cause of our wretchedness. Before God fills up this void, He puts us in the way of faith; with this condition, that if we never cease to regard Him as our last end, if we use creatures with moderation, and refer to His service the use we make of them, at the same time contributing faithfully to the glory which it is His will to draw from all created beings, He will give himself to us to fill up the void within us and make us happy. But if we are wanting in fidelity, He will leave in us that void, which, left unfilled, will cause our supreme misery.” ~Fr. Lallemant, S.J., Spiritual Doctrine
