Where is my Faith–even deep down right in there is nothing, but emptiness & darkness–My God–how painful is this unknown pain–I have no Faith–I dare not utter the words & thoughts that crowd in my heart–& make me suffer untold agony.
Source, in full
Undated letter indicating that, at least at times, Mother Teresa's theological doubts were strong enough to be regarded as Christian atheism, reported by Time (9 March 2007) , and quoted in "Was Mother Teresa an atheist?", in The Guardian (24 August 2007)