Our strength to make this descent [into the depths of our own hearts] is our vulnerability. To ascend the sky of reason we must become hard: doubting, critical, endlessly testing and proving. We need hard heads but soft hearts. Here in the depths, our strength is our softness. We must become little children, for only a little child is strong enough to open the greatest gate, the gate of the Kingdom of heaven. That gate is the heart, and who can open your heart like a child? The child in us is called by three names: faith (trust, openness), hope (idealism, wonder), and love (adoration, yea-saying). These are all terribly vulnerable things, quickly laughed at by a cynical, sophisticated world. (Peter Kreeft: The Heart’s Quest for Heaven (Part II))