To despair over one's sins indicates that sin has become or wants to be internally consistent. It wants nothing to do with the good, does not want to be so weak as to listen occasionally to other talk. No, it insists on listening only to itself, on having dealings only with itself; it closes itself up within itself, indeed, locks itself inside one more inclosure, and protects itself against every attack or pursuit by the good by despairing over sin.
Soren KierkegaardImagine hidden in a simpler exterior a secret receptacle wherein the most precious treasure is deposited - there is a spring which has to be pressed, but the spring is hidden, and the pressure must have a certain strength, so that an accidental pressure would not be sufficient. So likewise is the hope of eternity hidden in man's inmost parts, and affliction is the pressure. When it presses the hidden spring, and strongly enough, then the contents appear in all their glory.
Soren Kierkegaard