Fr. Raniero Cantalamessa, OFM Cap, is the preacher to... well, to the pope. Here's a link to his thoughts on Mother Teresa's "atheistic" tendencies...
It has lots more "meat" than the previously-posted TIME article, since it actually quotes her writing extensively. Fancy that. An article on Mother Teresa's last writings that uses excerpts from her writings! TIME should take note.
Here's a sampling:
"Mother Teresa has words that no one would have suspected of her: 'They say people in hell suffer eternal pain because of the loss of God. ... In my soul I feel just this terrible pain of loss, of God not wanting me, of God not being God, of God not really existing. Jesus please forgive the blasphemy.'" ~Fr. Cantalamessa
Sweet comfort to sinner. Challenge to all would-be mystics.
Lord, make me a mystic. But not yet.