Faith and Doubt on the Feast of St. Thomas

On this Feast of Doubting Thomas, I reread the words of Joseph Ratzinger (now Pope Benedict XVI) on pages40-41 of Introduction to Christianity: 

[B]oth the believer and the unbeliever share, each in his own way, doubt and belief, if they do not hide from themselves and from the truth of their being.  Neither can quite escape either doubt or belief; for the one, faith is present against doubt; for the other, through doubt and in the form of doubt.  It is the basic pattern of man's destiny only to be allowed to find the finality of his existence in this unceasing rivalry between doubt and belief, temptation and certainty.  Perhaps in precisely this way doubt, which saves both sides from being shut up in their own worlds, could become an avenue of communication.  It prevents both from enjoying complete self-satisfaction; it opens up the believer to the doubter and the doubter to the believer; for one, it is his share in the fate of the unbeliever; for the other, the form in which belief remains nevertheless a challenge to him.

Back to Thomas, Pope St. Gregory the Great wrote:  "The disbelief of Thomas has done more for our faith than the the faith of the other disciples."

UPDATE:  For Susan's excellent reflection, click here.