"Mathematics had never had more than a secondary interest for him [her husband, George Boole]; and even logic he cared for chiefly as a means of clearing the ground of doctrines imagined to be proved, by showing that the evidence on which they were supposed to give rest had no tendency to prove them. But he had been endeavoring to give a more active and positive help than this to the cause of what he deemed pure religion."

Source : "Mary Everest Boole, Collected Works" by Mary Everest Boole, edited by ‎Eleanor Meredith Cobham, (p. 40), 1931.

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