The writings address numerous topics, but the ones most likely to create a stir are what Doubleday called the "dark letters."
"Please pray specially for me that I may not spoil His work and that Our Lord may show Himself -- for there is such terrible darkness within me, as if everything was dead," she wrote in 1953. "It has been like this more or less from the time I started 'the work.'"
Then in 1956: "Such deep longing for God -- and ... repulsed -- empty -- no faith -- no love -- no zeal. (Saving) souls holds no attraction -- Heaven means nothing -- pray for me please that I keep smiling at Him in spite of everything."
And then in 1959: "If there be no God -- there can be no soul -- if there is no Soul then Jesus -- You also are not true."
At times she also found it hard to pray.
"I utter words of community prayers -- and try my utmost to get out of every word the sweetness it has to give -- but my prayer of union is not there any longer -- I no longer pray."