[HarleyD]

In times of interior desolation I do not lose my peace, because I know that God never abandons a soul

And that is the difference. Notice your author's correct conclusion compare to Mother Teresa view.

[lastchance]

We do not have Mother Theresa every thought put on paper. I would never assume to know the whole of a person by letters she wrote. So how you could judge Mother Theresa incorrect puzzles me.