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William Edward Hartpole Lecky · 1865

This faint circular stamp belongs to the Toronto Public Library, dated July 31, with the year partially obscured. Rationalism, in this context, refers to the historical shift toward using reason and evidence rather than tradition or dogma to understand the world.
William Edward Hartpole Lecky (1838–1903) was an Irish historian and philosopher famous for his secular approach to the history of ideas. "M.A." stands for Master of Arts.