From ABC News:
In dozens of letters spanning 66 years, Mother Teresa described the “emptiness” she felt and confessed her struggles with faith and the existence of heaven in pages she had planned to have destroyed.
To millions her work still shines as the example of Christlike devotion. It brought her the Nobel Peace Prize and beatification by Pope John Paul. But once she began her work in India she never heard God’s voice again. Nine years after she founded her mission in Calcutta she wrote, “What do I labour for? If there be no God — there can be no soul — if there is no Soul then Jesus — You also are not true.”